The first production Grebe II, this type entering RAF service in October 1923 and remaining first-line equipment until mid-1928.

The Grebe II was the first Gloster aeroplane produced in substantial numbers for RAF service.

The second prototype Guan with Lion VI engine and turbo-supercharger above the propeller shaft.

The second prototype Guan with Lion VI engine and turbo-supercharger above the propeller shaft.

A Mars X Nightjar at RAE Farnborough in 1922. Nightjars of No 203 Sqdn, RAF, operated in the Middle East during the Chanak crisis.

A Gamecock II in Finnish service.

The Gamecock I was essentially an improved Grebe and 90 production examples were supplied to the RAF.