This MiG-21 was from the Hungarian Air Force and is on display at the Imperial War Museum at Duxford.
The Mikoyan-Gurevich MiG-21 (NATO reporting name: Fishbed) is a supersonic jet fighter and interceptor aircraft, designed by the Mikoyan-Gurevich Design Bureau in the Soviet Union.
There was also a Mig-21 at RAF Cosford.