The Hoopoe was a private venture naval fighter that first flew in 1927 and went through many changes before it was sent for service trials in 1932. By then progress had overtaken it and the Hawker Nimrod became the FAA's preference. The photo shows the Hoopoe in its 1929 configuration with an Armstrong-Siddeley Jaguar engine in place of the original Bristol Mercury and single-bay wings in place of two-bay wings. The Jaguar engine was later replaced with an Armstrong Siddeley Panther. N237 was scrapped in 1932. Photo from: Imperial War Museums