 Since the Percival factory was concentrating on production of the Percival Proctor and the Merganser light transport aircraft, production was sub-contracted to the Blackburn Aircraft works at Brough.After these modifications, the Prentice was passed into RAF service, initially with the regular Flying Training Schools (FTS) including the RAF College, Cranwell where they replaced the remaining de Havilland Tiger Moths.Later deliveries went to the Reserve Flying Schools (RFS).