Airspeed AS.56

After the Air Ministry issued the specification F.6/42 to replace  the Hawker Typhoon, which was an excellent fighter bomber but was considered too big for a single-seat fighter. Many companies showed interest, among them Boulton Paul, Hawker (which won the contest with the Hawker Tempest), Vickers, Supermarine, Westland and Airspeed.

It was going to be powered by a Napier Sabre IV, as it was a requirement of the Ministry's specification. The engine was going to be equipped with a fan-cooled annular radiator in order to reduce drag. It was going to have four 20mm cannons in the wings and, most probably, bomb capacity under the wings.
Anyway, the design on the work was abandoned, however the arrangement of the radiator was continued by the Napier in order to solve the Sabre's overheating problems and it was tested both in Hawker Typhoon and Hawker Tempest.

Sources:
1. Midland Publishing - British Secret Projects - Fighters and Bombers 1935-1945
2. Putnam's Books - Airspeed Aircraft since 1931