High Quality Content by WIKIPEDIA articles! The Royal and Parliamentary Titles Act 1927 (17 Geo 5, c. 4) was an Act of Parliament of the United Kingdom, granted Royal Assent on 12 April 1927, that formed a significant landmark in the constitutional history of the UK and British Empire as a whole. It altered the name of the United Kingdom of Great Britain and Ireland to the United Kingdom of Great Britain and Northern Ireland, recognising the separation of Southern Ireland from the United Kingdom as the Irish Free State in 1922.