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May be a variation of The F11/37 spec??
The British Specification F11/37 was for a twin engine, 2 seat fighter capable of day & night operations, in a fighter or ground support roll.. Armed by 4 20mm canons housed in a power operated turret. The specification called for an aircraft capable of 370 mph at 15,000 ft, with a service ceiling of 35,000 ft with an endurance of 2.5 hours. The Aircraft was to be armed by 4 20 mm canons with 240 rounds of ammunition & a single 250 lb bomb carried internally.
Boulton Paul P92 was designed to meet this specification & it was this company that the contract was awarded to. Serials L9629 & L9632 being allocated to the two prototypes. Heston Aircraft built a half scale model of the P92, called the P92.2. The serial V3142 was allocated to the P92.2, which was flown during May 1941. With the cancellation of the P92 project the P92.2 was stored for some time before eventual scraping.
At the time of Munich Bristol proposed using Hercules engines on a new aircraft using mainly Beaufort components, this design was eventually called the Beaufighter.