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
https://www.gamblingcommission.gov.uk/licensees-and-businesses/guide/page/gambling-commission-licence-conditions-and-codes-of-practice
(Policy paper) published 23 June 2015
https://www.gov.uk/government/publications/alternative-dispute-resolution-for-consumers/alternative-dispute-resolution-for-consumers
https://www.gov.uk/government/publications/unfair-contract-terms-cma37
https://www.asa.org.uk/topic/gambling.html