Are you looking for the best new betting sites to take your online gambling experience to the next level? Look no further!
We've researched and compiled a list of top-notch, trustworthy sites that offer exciting games, generous bonuses, and an overall fantastic user experience.
Discover the newest betting sites that welcome UK players to their site this June 2023.
All our listed gambling sites offer excellent sign up bonuses and are fully licensed by the UK gambling commission.
Charge up your Odds at Rhino bet with their daily specials and Best Odds Guaranteed on racing markets—a new bookmaker for UK players with a £10 free bet offer.
New UK betting site for 2022 with Sports and Casino.
A new casino and sports betting site for UK players in 2023.
Join the Casumo Sports and Casino site for a 100% bonus up to £25 + 20 Bonus Spins on Sahara Riches Cash Collect when you make a first deposit.
A new and exciting bookmaker for UK players with horse racing and sports betting.
UK & Irish bookmaker with no rival in Promotions on offer. Live Streaming, In-Play betting and Free Spins.
Sports and Casino site with 20 years in the gambling business.
Join a New betting site for UK players launched in 2021 and get our exclusive £15 free bet.
Reach for the stars with BetNeptune, one of many new entrants powered by ProgressPlay ltd software and offering a £10 free bet. If Sports Live betting is something you like to bet then this betting site delivers with their excellent inerface and live display.
UK Mobile online bookmaker choice for Football, Sports and Casino and optimum Live betting experience.
New UK betting site that offers fast live betting action with a good choice of sports to bet.
Join Vegas Paradise Bet to get a free bet of up to £20 every Monday with Promo Code: FBM
24/7 Customer Service. Excellent Live In-Play betting with competitive odds. Live casino, games, eSports, Virtual, football & horse racing.
UK bookmaker since 2003 with excellent live betting and promotions, fully licensed by the gambling authorities of the UK, Ireland, Sweden and Malta.
New UK betting site from 2020 offering a £10 free bet welcome bonus and rewards for loyalty.
Check out the latest betting offers from online bookmakers below.
It's not just about the free bets and deposit bonuses – you can also get Money Back offers, No deposit, Bigger Odds, and many other forms of bonus bet offers.
The list below incorporates the best of all the sports betting offers that are new and available for UK players. To see the latest bookie promotions by sport, you can visit our dedicated page on betting offers.
Join Vegas Paradise Bet to get a free bet of up to £20 every Monday with Promo Code: FBM
Predict 6 football scores to win up to £1 million every week with the excellent free to enter Bet365 challenge.
StarSports Above Average Darts Money Back Offer - gives you up to £50 as a free bet.
Place your Lucky 15 bets at Rhino bet for extra bonuses on top.
Get up to £30 in Bonuses when you make your 2nd deposit at HighBet.
Get your winnings sooner with the Bet365 2 Goals Ahead Early Payout Offer.
Make your first Acca bet at Betway for up to £30 back as a free bet.
Get x3 odds on only 1 winner at Boylesports on your Lucky 15 bets.
Get paid out on your bets if your football team goes 2 up at any stage within 90 mins during the match.
William Hill £10 No Deposit Bonus Review - Get your £10 No Deposit Bonus from William Hill to play on their Must Drop Jackpots this month.
We know it can be hard to sort through the ever-increasing amount of new UK betting sites online. So we have saved you time by selecting only the best sports betting sites for beginners and seasoned gamblers.
All the new bookmaker sites are licensed by the UK gambling commission and rated top of the pile by our gambling experts.
Compare the exciting offers and choose from the best online sports betting sites to get your free bet credited today.
The new UK sportsbooks have to be innovative in their attempts to attract customers. Offering bonuses and special promotions is one of the most effective ways to convince punters to register an account and start wagering.
The new online betting sites will always focus on their welcome sign up bonus for new customers firstly.
Look below at which new online bookmakers have arrived on the scene recently and which are rated as the best for individual sports choices.
See our list of the top 10 new football betting sites for 2023. These online football-focused bookmakers are open for UK players to join. They are all UK Licensed and offer all the football bet features you need to place your tips and selections like:
Live In-Play betting, Cash Out bets early, Results and Statistic services, football-specific promotions like 2 Goals Ahead payout, Bore Draw Refund, and many more sometimes specific features only to that bookmaker.
Of course, all the new football betting sites offer a nice welcome bonus, whether in the form of free bets, deposit bonuses, or money-back deals.
Here's our list of the Top 10 new football sites.
They present excellent racing betting promotions that are unique and competitive compared to the more established known horse racing bookmakers like Betfred and bet365.
Top of the list of new horse racing betting sites is newcomers StarSports, BetGoodwin, and BetZone, with MrPlay sports and Hollywoodbets all improving their racing coverage in the past few months.
Many new sports bookmakers don't offer betting apps simply because they offer a website already configured for any mobile device – so it's already mobile-ready.
However, some of the latest new betting sites still make an effort and offer a dedicated betting app that you can download from the Google Play store.
Here are those new bookmakers with their latest apps. The welcome bonuses still apply if you open a new account via the betting app unless it's stated otherwise on the website.
See our list of the top 10 new casino sites for 2023. These online casinos are for UK players and are dedicated casino-only gambling websites.
All come with generous welcome offers. Usually, a combination of deposit bonuses and free spins in the package (although be aware of the terms and conditions which involve a high wagering amount before the release of the bonus money awarded).
Read more about the newest betting sites with our short featured reviews below.
When we add a new online betting site to our page, we like to provide more information about the company and not just list the site name and bonus.
A £10 free bet awaits new players to the UK-licensed site. Massive range of football leagues to bet on plus many diverse sports the only one lacking would be UK horse racing.
The Live betting interface has the same efficient layout as all the Progress Play-operated online bookmakers.
There's a wide range of payment methods and live chat to help. Recommended for sports and football bettors with fast payouts.
Register New BetNeptune Account
If you are looking for an independent bookmaker offering high limits and competitive odds across all sports but with a particular emphasis on horse racing betting markets and offers – StarSports is your go-to.
The UK bookmaker, now based out of Brighton, began its journey as Star Racing in 1999 and has retained its independent status as an exclusive and private bookmaker. Enjoy a different betting experience at Starsports with their Credit, Debit, and Hedging betting services for clients.
You can also enjoy plenty of Money back free bet offers across various sports.
Register New StarSports Account
Launched in 2022, Luckster is owned by the same outfit as Mr. Play Sportsbook.
A fully UK Licensed operator based out of Malta, the betting site offers Sports, Casino, and Live Casinos. There's a vast range of sports to bet on – nothing left out here, and the main feature is their live betting interface.
It's a slick-looking, fast-displaying online bookmaker for players looking for a fresh approach to gambling enjoyment.
All are presented with a luck of the Irish logo. It is short on promotions, but it offers Cash Out and Acca boosts and the welcome sign up free bet.
Calling all horse racing fans! – you may be familiar with the telephone betting site of Goodwin Racing – well, this new bookmaker is their first foray into the online sports betting market. The BetGoodwin site is owned by Goodwin Racing Ltd.
Although the betting site offers sports from Alpine skiing to Table Tennis, it will undoubtedly attract a flurry of new horse racing betting fans through its top promotions.
BetGoodwin stands out from the crowd of existing and new betting sites with its racing promos of up to £100 free bet offers. These apply to scenarios like your horse losing by a Nose, Beaten under 1/2 length in a Chase, Leading but falling at the Last, or 2nd to a 50/1 shot or bigger.
All come with full terms and conditions that you should check out first.
Register New BetGoodwin Account
The BetDukes betting site offers a £10 free sports bet for new players with Cashback and a Rewards program for loyal punters. Live betting is this bookmaker's main topic of interest, with a good range of sports to bet on and a good choice of banking options (like ApplePay, PayPal, payviaphone, and more).
The Rhino.bet bookmaker is one of the newest betting sites on the Playbook Gaming platform. What this means to you as a new player to the site is that you can expect a leading Casino and Sports betting platform.
The betting markets are extensive, with various sports and casino games catered for. Rhino.bet runs on the same platform as another of the brand new bookmakers StarSports, (see above).
The difference between the two bookmakers is that Rhin.bet focuses more on football betting and associated promotions, whereas StarSports is your 1st pick for everything horse racing betting.
Register New Rhino bet Account
BetZone offers a massive choice of excellent betting promotions and £60 in free sports bets. They also have over 46 retail betting shops throughout the country. Offer In-Running betting and have a decent Casino site as well.
With one of the biggest welcome bonuses and free spins included, too, it's worth checking out this site – we were impressed when we did.
HighBet Sports is a newly licensed UK betting site as of April 2021 and offers an opportunity to collect a £10 bet bonus to try the site out.
The bookmaker provides a fast, responsive experience when navigating around – it also promises higher odds on the many thousands of Leagues from around the world it offers up pricing on.
Cash out, Live betting, and a Live Casino are all offered for increased entertainment.
A commitment to fair play and responsible gaming is noteworthy. A good choice of banking options and a satisfactory customer support service 7 days a week (although not 24/7) are offered for any help queries.
As always, with our listed bookmakers, you can read more in our reviews and, in this case, on our Highbet sports review page.
Register New HighBet Sports Account
One of several new bookies that started as an established Casino and then added a sports betting side to its operation MrPlaySports offers a massive range of sports and markets for UK players.
Some of the best odds are available at this new bookmaker that offers a decent casino bonus, and sports bet £10 get £10 offer.
They are also fully UK licensed and operated by Marketplay LTD, a Malta-based company.
Open a betting account today, and you'll be presented with plenty of ongoing promotions like Cash Out, Acca Boosts, and Fast betting markets to spice up your bets and reward you.
There's no mobile app at MrPlaysports because you don't need to download one – everything works as it should on any mobile device. One of a few of our 2017 recommended new online bookies to join.
Register New MrPlaySports Account
Hollywoodbets may be new to the UK betting site market, but it's been around since 1999 and was founded as a single purple (see the logo and website colour layout) betting shop in Durban, South Africa.
What you can expect from this newly UK gambling commission licensed betting site is a wide range of promotions from Best Odds Guaranteed to Cash Out and Loyalty free bets – take a look at the Hollywoodbets Promotions page to see what we mean.
The list of sports betting and games entertainment doesn't fall short either, with all major football and UK horse racing events covered.
Features of the betting site include the ability to place Live in-play betting and Pre-match bets. Online Casino, Slots, Online Scratch Cards, Online Lottery Style Games, Betgames TV, Virtual Sports, and E-sports.
We reckon seekers of the new UK bookmakers will be thoroughly entertained and satisfied with what's on offer at Hollywood bets.co.uk.
Register New Hollywoodbets Account
TheOnlineCasino is a kind of reverse hybrid – one of a few sites in the UK that started as an online Casino and added sports betting later – and that is, of course, why it has made our new bookies list for 2023.
So as well as providing players with a decent casino bonus, you can get a 10 free welcome offer when you deposit 10.
The bookmaker is regulated by the UK gambling commission and fully licensed.
Its forte is the vast range of live events to bet on with some of the best odds available. There is no mobile app, but it does not matter when the site is fully configured to work on all mobile devices.
Register New TheOnlineCasino Sports Account
Help yourself to a 10 free bet bonus when you join BetitOn, a new online betting site from 2020.
Fully regulated by the UK gambling commission, the bookmaker is operated by Aspire Global International LTD and is based out of Malta, meaning dual licenses from that country and the UK.
New customers can expect a full range of markets, including football, horse racing, virtual sports, and more.
It's a no-download mobile betting site without needing a separate app.
The bookmaker features a full and live casino but strangely comes without a separate casino bonus.
However, as new bookies go, it has a wide range of betting markets, sports to bet on, and many attractive promotions.
A new UK Gambling Commission licensed site for 2020, Hopa Sports comes to the Bet1015.com new betting sites listing, offering a complete choice of sports to bet on, including the staples of football and horse racing.
Notable features we like are the Cash Out and Acca Bonus promotions, but what takes the eye is Hopa Sport's “BetAssistant” tool. The named feature crunches historical data on football matches to give the bettor a recommended football bet.
Over a month, you could expect to get a range of 1500 to 3000 In-Play bet suggestions. The information is gathered from over 400 football leagues worldwide.
In our mind, the BetAssisstant looks like an exciting and worthwhile betting aid from Hopa Sports.
The new sports betting site is sure to prove popular to bettors in the UK and Irish online bookmakers market as it offers a full choice of sports from those countries.
The new sports betting side of Mobilewins was launched in 2019.
However, this UK Gambling Commission-licensed site already has an established Casino and Live Casino setup founded in 2013. There's a good choice of payment methods, including all the e-wallet offerings you need.
A simple deposit bonus for sports, the website layout is the same as Vbet and offers a Live Multiview display.
As the name suggests, this gambling website is especially geared for sports and casino mobile betting players.
Register New Mobilewins Account
Vbet have elevated their online bookmakers brand name by partnering with Premier League football club Arsenal. The UK Gambling Commission licensed betting site offers a good selection of football markets and leagues to bet on.
Horse racing has been recently added to complete a full choice of main event sports to bet on.
There are plenty of useful offers and features available for new punters including cash out (full and partial), acca insurance and 0-0 scoreline bonus returns.
The Vbet bookmakers is fast becoming a serious contender in the new betting sites arena.
A new bookmaker with Irish roots that offers a wide range of promotions including a separate sign up bonus offer for Ireland and UK bettors.
A sports, casino, virtual and lotto betting site with plenty of added promos from each section for players. You really are spolit for choice in cashbacks, insurance on winless bets, free bets, free spins and a loyalty programme.
Strong on football and horse racing odds and markets. The new betting site holds Irish and UK Gambling Commission licences.
The cool thing about joining and playing at Karamba is that you can experience the awesome Karamba casino site with an excellent sports betting offering. The bookmaker holds a full UK gambling commission license.
The bookmaker also has some unique sports oriented bet offers like their Karamba bot. This feature suggests bets to be had based on Statistical information of the game you choose to bet on, see it as a handy aid rather than a guarantee of success.
It's a novel and unique betting feature either way.
There's also the chance to cash out your bets and a fully intergrated in-play betting offering.
The Karamba sports free bet bonus offer means you get a chance to earn some extra cash when you join and place your first bet.
You can read our full Karamba review to learn more about the bookmaker and what the site has to offer. We reckon Karamba is another worthy new betting site fit for UK punters.
Register New Karamba Sports Account
All these reasons give new customers a good reason to try out the new sports betting sites uk features, open a new betting account and cash in the bonus offer money.
In the past if anyone wanted to set up a new bookmaker company in the UK, they had to start with one betting shop.
They would then slowly expand throughout the country. Large bookmaker companies established as a result of a merger between two or more companies that controlled smaller fractions of the overall market.
It usually took many years and even decades before a small local bookmaker could grow to become one of the leading operators in the country.
Everything was slower back in the days.
When people started making reliable and safe payments over the internet, some entrepreneurial minded and innovative people realised that placing sports bets over the internet is also possible. Most of the already established and popular UK bookmakers went online.
However some new players appeared on the market as well.
The studies and surveys conducted by the UK Gambling Commission, and numerous other relevant bodies and organisations, show that online gambling is becoming increasingly popular over the years and that many new bookmakers now receive most of their incomes online.
With the increased growth of the mobile betting market, we can expect that trend to continue in the future.
Since there are a lot of customers and the industry is growing, it is only logical that many online sports betting sites would want to invest and enter the market, hoping that they will manage to attract a significant number of customers.
Since a person can have accounts at as many UK betting sites as they like, new operators establish betting sites in an attempt to attract both people who haven’t been wagering online, but also those who already have accounts at existing betting sites.
All new betting sites should be licensed by the UK Gambling Commission.
The bookmaker needs to obtain an appropriate licence from the UK regulator – this is the body that ensures safe and fair practices are operated by the new betting sites.
In the United Kingdom, the UK Gambling Commission is the body that is in charge of licencing and regulating online betting operators.
Online betting sites registered by companies who are based in the UK, as well as new bookmakers that are owned and operated by companies that are located elsewhere have the right to apply for a licence.
Companies that are regulated by the UK Gambling Commission usually display the Commission’s logo on their website.
This is so that UK punters can be certain that new betting companies website is legitimate and promotes responsible gambling.
Websites UK licensed by the Gambling Commission mean that the authority will pay attention to its work and ensure that the operator works in accordance with UK rules and regulations.
Operators that are licensed and operate in accordance with the law will not try to abuse your personal or financial information nor will they share it with third parties.
Betting through a website involves providing personal details such as, name, address, phone number, email and age.
Banking details such as credit card number and/or bank account number are also required.
If someone manages to interfere in the connection between your computer/mobile device and the operator’s servers, they will obtain valuable information and possibly misuse them, steal money from your account, etc.
That is why it is essential that betting operators provide adequate degree of protection. This will ensure that your data is kept safely and nobody else will have access to it.
Websites usually employ advanced encryption technology. This software makes the data incomprehensible to any possible intruder who might be trying to access it.
The table below lists the latest bookmakers that have been issued with a UK gambling license. Both betting sites for sports and casino are covered.
This gives you an insight to the newest bookmakers online seeking a UK Gambling Authority approved license.
We have ignored the “expires, suspended for non payment” and others that do not meet the criteria as being fully licensed UK operators.
You can read more about the features of each of the new bookmaker sites, that exist on this page and throughout our site, plus our own ratings in the reviews section on our website.
Bookmaker/Casino | Website Name/Domain | Active From | UK GC Account # |
---|---|---|---|
GB Sports Advisors Limited | www.geoffbanks.bet | 17 Nov 2022 | 54095 |
Dragoni Technology LTD | www.dragoneye.gg www.dragoni.gg | 13 Sep 2022 | 58959 |
Digital Division Ltd | www.slotstemple.com | 30 Nov 2021 | 58086 |
E.G.G. Limited | dragonbet.co.uk | 4 Aug 2021 | 58016 |
Casumo Services Limited | casumo.com | 23 Jul 2021 | 39265 |
Copybet UK Limited | www.copybet.com | 16 Mar 2021 | 53774 |
Booming Games (Malta) Limited | booming-games.com www.booming-games.com | 18 Jan 2021 | 57254 |
The reason why punters register at new betting sites is, of course, because they want to place bets.
That’s why it is very important to see what each of the new betting sites has to offer so you can compare features.
In terms of the number of available sports, leagues and events, but also betting markets and odds.
If you follow only one or two sports and intend on betting on just those sports, then it is sufficient to check if the new bookmakers website features them. If the sport in case is popular, then you shouldn’t worry.
But if your interests are for more diverse betting markets, then you would prefer a website that includes a large number of sports in their overall offer.
It is important to see the range of markets and the available bet types for each sport that are featured at the bookmaker.
This is especially true if you’re one of those punters who wants to bet on more unusual selections.
An example of this would be whether there’ll be a red a card during a match. Whether there’ll be a goal in the first 15 minutes.
The new UK betting sites will offer competitive odds for punters to attract new sign ups.
The odds are the most important part of the betting offer. The higher the odds, the more money you’re going to earn if your bet wins. When you’re betting larger amounts of money even a small difference in the odds can mean a lot.
If one betting site offers better odds than another, in general for most selections, than the first is probably a better option, but things usually aren’t that clear.
Site 1 may offer significantly better odds for a particular selection than Site 2, but slightly lower odds for a number of other selections and vice-versa.
Sometimes it is best to pick the bet that you’d like to place. Then you can see which of the UK betting sites offer the best odds on that bet.
When you’re thinking of claiming an online bonus always check the ‘small print’.
The full terms and conditions, especially the terms regarding withdrawal of bonus winnings. The time frame during which you can use the bonus amount or free bet.
When it comes to funding your account the online betting sites should display the banking options clearly, usually in the footer.
Most minimum deposit amounts start at around £10/$10 for credit or debit cards.
The maximum deposit amount is usually around £5,000 or $5,000. This could be more depending on the online betting site own terms and method of payment you are using.
Communication between operators and customers is very important in order for new and existing players to retained.
This is why the best betting sites in the world will ensure quality customer support.
You will find live support available as standard on the new UK betting sites.
Any queries you have should be answered in real time and effectively. After all the new bookmakers want to retain your services as a player.
The bookmaker should always want to ensure that customers are served with accurate and timely responses on any issue(s) they may have.
It is key to a quality new bookmaker site in 2021 that customer support is visible, professional and works.
We have listed what support options you would expect to have available:
The introduction of new online bookmakers for the UK betting market has to be a good thing. If nothing else it provides more betting options for punters.
More competition from the new betting sites means more bonus offer deals to choose from, this can only aid a punters operating balance.
New UK bookmakers also mean the latest in software and innovation, again this a plus for a players gambling strategy.
They also promote a responsible gambling message which is a must for all who gamble should a player need to seek help.
Answers to your questions on the new sports betting sites below.
If you are looking for the best in amount of welcome bonus from a bookmaker then BetZone currently (Jan 2023) offers a £60 in freebets bonus that ranks as the highest.
There are 2 more after that with Bet365 and StarSports bothe offering £50 bonus deals (one as free bet deposit bonus amount and the other as up to £50 in Money back deals).
In my opinion these would be the best new betting site offers to take advantage of.
All the new betting sites offer football to bet on so it's just a case of deciding which of them provide the most features and the best football odds.
As a quick guide we are looking for new football betting sites that offer all these, at the minimum, for UK players;
The biggest range of football betting markets
The most competitive odds on football
Live football betting
Football betting promotions like;
Cash Out your bets early
0-0 Refunds on bore draw scores
Enhanced Odds
After analysing the new UK betting sites for the football features above we can narrow the list down to the following top ranked websites.
StarSports
MrPlay Sport
BetDukes
Betiton
BetZone
Vbet
A point to note though is that every one of the new football betting sites are worthy enough to sit on the list for UK players.
All the football betting sites provide a good range of promotions geared for the football bettor.
Something that is apparent in checking out the new betting sites is that a few do not seem to offer UK racing at all. Although you will find US horse racing at some of those sites that don't.
These betting sites are generaly powered by one of the leading betting software providers – PlayTech as well.
As this is the case we have to whittle down which of the new horse racing betting sites are best for UK bettors.
StarSports and BetGoodwin are the current leaders among the online UK betting sites in their racing promotions and competitive prices.
Quinnbet follows a close second with it's primary focus on horse betting offers for all UK and Irish betting sites players.
Below is a list of the best new horse racing betting sites we reckon you should check out first.
BetGoodwin
StarSports
BetZone
Hollywoodbets
Karamba
Hopa
Vbet
Yes it is – all UK betting sites and shops have to be licensed by the UK Gambling Commission and this regulatory body was set up by the decree of the UK Gambling Act of 2005.
The Gambling Act 2005 elevated the UK betting market into the modern world of gambling.
The bill set up the process whereby all potential online bookmakers had to be licensed and inturn enforced a protection for the bettors against unscrupulous organisations.
The Gambling Act presented three main objectives for the new licensing system:
Preventing gambling from being a source of crime or disorder, being associated with crime, disorder, or as an accessory to crime.
Ensuring that gambling is conducted in a fair fashion.
Protecting children and other vulnerable persons from being harmed or exploited by gambling.
It's thanks to the above Gambling Act that the UK enjoys one of the most liberated but safe and secure enviroments for individuals to enjoy gambling online or in shops.
Choosing PayPal could be the key here - you'll get your money in a matter of hours, from 2 to be precise on average.
The best sites for fast payouts:
Bet365
Betfred
WilliamHill
BetZone
It would be hard to predict the best bookmaker odds every time as the prices fluctuate between each betting site.
However you can check the best odds on a sports event by visiting an odds comparison site like oddschecker.
There you will be able to compare prices against the leading bookmakers.
We can recommend though sites that consistantly show and offer better odds and these bookmakers are:
Boylesports
Bet365
William Hill
StarSports
BetZone
It is possible for a bookmaker to refuse a pay out but it would need good grounds for doing so - and even then you could contest this in the courts.
There have been several high profile cases with punter vs goliath (bookmaker) over recent years. Notably with bet365 and Coral.
In the end the cases are ususaly settled amicably in favour of the punter.
Most cases of a bookmaker refusing to payout have comeabout through a misunderstanding or lack of knowledge about the rules of an event by the punter .
One of the biggest in 2022 Sports company is Entain and they have a portfolio of well known UK bookmakers consisting of:
bwin
Ladbrokes
Coral
Sportingbet
Betboo
Gamebookers
Crystalbet
Stadium
Eurobet
Ladbrokes.com.au
Ladbrokes.be
Neds
US Brands
BetMGM
Borgata
partypoker
PartyCasino
Games Brands
partypoker
PartyCasino
Gala Bingo
Gala Casino
Gala Spins
Foxy Bingo
Foxy Games
CasinoClub
Gioco Digitale
Cheeky Bingo
Casino Las Vegas
Casino King
Bookies in fact make their money by including a margin to their odds, so in effect charging a transaction fee on each bet.
So, even if they need to pay out on a winning bet, they still earn a profit as long as they balance the level of stakes and pay-outs in their favour.
1. Football
2. Horse Racing
3. Snooker
4. Rugby Union Betting
5. Boxing
6. Cricket
7. Tennis
8. Golf Betting
9. Ice Hockey Betting
10. Dogs
They can arrive every month potentially but they will need to be granted a UK Gambling license first.
It's also worth noting that quite a few new bookmakers exit the UK market as well. They often cite tighter and stricter UK Gambling regulations as the reason for this.
Probabaly the most trusted betting site on the UK market would be the one(s) that have been around for the longest time.
These bookmakers wouldn't exist unless punters trusted them to payout on time and provide good odds.
Bet365
William Hill
Betfred