Westland Interceptor
First flown in 1929, the Westland Interceptor was an unsuccessful contender for a Royal Air Force fighter. Despite having an advanced monoplane design, it displayed unsatisfactory handling characteristics and the Hawker Fury was chosen for production instead.
The Interceptor was used for trials until 1935, with modifications to its tail to improve stability and the replacement of the replacement of the Mercury engine with a Bristol Jupiter VII, which was later fitted with a Townend ring to reduce drag.