Just re-reading Anthony Furze's biography of ACM Sir Wilfred Freeman. It was Freeman who gave the RAF the Mosquito and the Merlin engined Mustang (which the USAAF also had), amongst others. He is little known, but clearly were it not for his having been divorced he might well have been CAS rather than Portal, and that would have been an interesting ride. It is a very detailed book, and not a quick read but IMHO well worth the effort.