Were test aircraft free samples for the government, or did the Air Ministry buy them?
Short answerPrivately initiated prototypes were usually handed over for testing at the company's risk, with no promise that a production order would follow.
NotesAn audience member asks whether test aircraft functioned like free samples or whether the government bought them. A company pursuing an unsolicited design usually had to hand its prototype to the Air Ministry without a production guarantee. The manufacturer therefore carried the design and construction risk while government pilots evaluated the only flying example. That arrangement encouraged competitive initiative but could impose a severe loss when officials declined to buy the aircraft.