Letter from WSC (10 Downing Street, Whitehall) to Clement Attlee [Leader of the Labour Party] marked "copy" and "most secret" informing him that it now looks as though the Three Power meeting will open in Berlin [Germany, Potsdam Conference] on 15 Jul and stating that he believes Attlee should be present so that, "however the election may go, the voice of Britain is united." [carbon].