The National Archives (TNA) (formerly the Public Record Office) is an executive agency of the Ministry of Justice of the United Kingdom. It is "the UK government's official archive, containing 1,000 years of history".There are separate national archives in some of the devolved parts of the United Kingdom: the National Archives of Scotland holds government and private documents relating to Scotland and the Public Record Office of Northern Ireland holds records for Northern Ireland.

More information on the Wikipedia page [1]

The website is [2]