Nearly sixty years ago Sir Robert Menzies, Leader of the Liberal Party and Prime Minister of Australia, was trying to do a secret deal with his British counterpart, Harold Macmillan, for the supply of nuclear weapons to Australia, a deal he was keen to see done before the treaty banning atmospheric nuclear tests came into effect.

A formerly Top Secret file has been lying on the open shelves of the UK Public Records Office and now its National Archives since 1993.