RAF Buccaneer fighter aircraft, pilot's Missile control guidance handle.
Made by Dunlop with a parts Ref. No. AC. 61538.
Fitted inside the cockpit next to the pilot, for him to fire the missile (Bullpup) and then to control its trajectory to the target using the toggle button on the top of the handle. This example looks to be un-issued, and it still retains its parts label and control cable / plug.