History of the UK By Thomassss 1295 Establishment of the English Parliament under Edward I 1534 Henry VIII broke with the Catholic Church and founded the Anglican Church 1536 Wales is annexed by King Henry VIII ( England ) 1603 James VI of Scotland became James I of England 1707 England and Scotland officially united on common agreement 1801 Union with Ireland and creation of the UK of Great Britain and Ireland 1924 Independence of the Irish Free State, only Northern Ireland remains in the UK 1934 The Scottish National Party is founded 1973 The UK joins the European Economic Community 1998 Establishment of the Northern Ireland Assembly 1999 Establishment of Welsh Assembly 2020 Official exit from the European Union