Only licensed gambling sites are able to promote their gambling related sites in Great Britain, it is now deemed to gambling blocking sites illegal for any site that does not hold a license in the UK to promote or advertise their services anywhere in the UK should they not have a license, this is now law in the UK and is actively being enforced.definition gambling legal KINDT GAMBLING We license and regulate the people and businesses that provide gambling in Great Britain including the National Lottery. Find out more about us and how we. Social gaming. Some of the games you can play online might look like gambling but do not meet the legal definition. They may involve a game of chance for a. The Gambling Commission is an executive non-departmental public body of the Government of Kingdom responsible for regulating gambling and supervising gaming law in Great Britain (its jurisdiction does not extend to Northern Ireland.) Minister responsible: Karen Bradley MP, Secre.