One aircraft went to the Royal Aircraft Establishment for equipment tests and was retired in 1980.
His last official post saw him return to the Royal Aircraft Establishment.
Despite the termination of development, the second prototype remained flying with the Royal Aircraft Establishment until 1954.
Prospero was built by the Royal Aircraft Establishment in Farnborough.
During the second world war the company manufactured experimental radar aerials for the Royal Aircraft Establishment.
It flew with the Royal Aircraft Establishment on radio navigation development during 1926.
In 1940, he joined the Royal Aircraft Establishment at Farnborough.
Later he became Secretary of the Royal Aircraft Establishment in Farnborough.
In 1935 he left de Havilland and worked with the Royal Aircraft Establishment as a test pilot.
His first job out of school was junior fellow at the Royal Aircraft Establishment.
