The United Kingdom voted for withdrawal from the European Union in the 2016 EU referendum held on 23 June 2016, and afterwards there was speculation that the act would be either repealed or amended. In October 2016, Prime Minister Theresa May promised a "Great Repeal Bill" which would repeal the 1972 Act and import its regulations into UK law, with effect from the date of British withdrawal; the regulations could then be amended or repealed on a case-by-case basis.