Digressing slightly and regarding the Whirlwind (the 1st one) there's a fantastic book by Harald Penrose, he was Westlands most notable test pilot. The stories about the Whirlwind's sleek lines and the extent to which Teddy Petter went to keep the machine as drag free as possible, regardless of structural cost, make for very interesting reading. According to Penrose, Westland were the first to pressurise an aircraft. Flight testing of the Wyvern, both piston and turbo prop, is also an interesting read. Forget what the title is.
FEBA