The Gambling Commission was set up under the Gambling Act 2005 to regulate commercial gambling in Great Britain.
http://www.gamblingcommission.gov.uk/Home.aspx
http://www.legislation.gov.uk/uksi/2015/542/contents/made
http://www.gamblingcommission.gov.uk/ADR-Blog/ADR-LCCP-extract-Annex-A.pdf