Westland Welkin
The Westland Welkin was designed in response to a perceived threat of high altitude bombing by German aircraft. With an operating height of 45,000 feet, the Welkin was provided with a pressurised cockpit. Armament consisted of four 20mm cannon.
When production commenced, it was obvious that the Luftwaffe had discontinued high altitude flights, removing its intended role. 77 Welkins were completed, along with an additional 26 airframes. Two were used by the Fighter Interception Unit based at RAF Wittering from May to November 1944, but none entered operational service.
One Welkin NF.Mk.II was produced as a night fighter, but did not enter production.
Photographs of scale models of the Westland Welkin can be found here.