11/30/2011. Remarks by Johan Visschedijk: "Intended to meet the requirements of Specification F.7/30 calling for a four-gun day-and-night fighter, the private venture Bulldog Mk.IV prototype was, in fact, the second Bulldog Mk.IIIA converted. Finished in RAF colors with the 'Class B' marking R-7 it was flown in its new guise in the spring of 1934, it competed with the Gloster SS.37 (prototype of the Gladiator) which was eventually selected to fulfill the requirement. The Air Ministry agreed to buy the prototype for flight testing of various long-chord cowlings, with and without controllable gills, for the Mercury VIS.2 engine with Hamilton variable pitch propeller, and it became K4292 on July 26, 1934."