If you want to self-exclude from an individual bookies, you can contact them directly via their customer service department. The details of which will be displayed on that site. All UK gambling sites offer a self-exclusion program that you can register with. But, if you want to exclude yourself from gambling at any site in the country, then you can sign up to programs like Gamstop, which will ban you from using any real-money site in the UK for a set amount of time.