Gordon Cameron Jackson (19 December 1923 – 15 January 1990) was a Scottish actor. He is best remembered for his roles as the butler Angus Hudson in Upstairs, Downstairs and as George Cowley, the head of CI5, in The Professionals. He also portrayed Capt Jimmy Cairns in Tunes of Glory, and Flt. Lt. Andrew MacDonald, "Intelligence", in The Great Escape. (Via Wikipedia)