Would better 1930s engines push the Fleet Air Arm toward a mixed fleet or a common twin-engine aircraft?
Short answerA common twin-engine airframe is plausible because it could cover several roles and greatly simplify Far East logistics.
NotesOne twin-engine airframe could combine fighter attacks with strike, reconnaissance, and anti-submarine work in this counterfactual Fleet Air Arm. Supporting one type would simplify the logistics of a force operating against Japan in the Far East. A proposal to introduce a second airframe would therefore have to justify the additional support burden. The Beaufighter, Mosquito, and eventual Sea Hornet illustrate the sort of long-range aircraft envisaged, with enough versatility to cover several carrier roles.