The UK is mainly centred around football. Football is definitely the biggest market for customers to bet on and every site offers a wide variety of betting options and special promotions for new customers. There a lot of other sports that are popular in the UK, such as: Tennis, Golf, Darts, Horse Racing and Rugby. American sports are definitely an upcoming market in the UK and will constantly grow over the next few years. If some of the above sports aren't what you are looking for, you'll definitely find your favourite sport over numerous sites.