Auster, Proctor, Northrop N-3PB, Rota, DH91 Albatross

The British Taylorcraft Auster was a light aircraft used in large numbers by the RAF for artillery spotting and communications duties.
The Percival Proctor was a radio-trainer and communication aircraft, developed from the Percival Vega Gull, and produced in large numbers during the Second World War.
The Northrop N-3PB floatplane patrol-bomber was the first aircraft to be produced by the independent Northrop Aircraft Inc after its foundation in 1939
The Avro Rota was the name given to twelve Cierva C.30A autogiros built under licence for the RAF by Avro during 1934-35.
The de Havilland D.H.91 Albatross was a pre-war passenger aircraft produced in very small numbers, and which served as a transport aircraft during the Second World War.