The Gloster Javelin is a twin-engined all-weather interceptor aircraft designed and produced by the Gloster Aircraft Company. It was operated by the Royal Air Force from the mid-1950s until the late 1960s and was the final aircraft design to bear the Gloster name.

The Javelin was replaced in the interceptor role by the English Electric Lightning, a supersonic aircraft capable of flying at more than double the speed of the Javelin. The Lightning entered service with the RAF only a few years after the Javelin. Fighter bomber and aerial reconnaissance variants were proposed, as well as the supersonic Gloster thin-wing Javelin, but none were pursued. The Javelin had a relatively short service life, the last examples were withdrawn from operational service in 1968 following the phased-in introduction of the Lightning. During this time both aircraft were operated by the RAF.

https://en.wikipedia.org/wiki/Gloster_Javelin