What is your reference for all this? I am searching for VL Vihuri, and I am finding stuff on a post-war single-engined trainer. I am finding literature on a pre-war 415mph unarmed twin-engined bomber called the Wihuri, on
alternatehistory.com, but, um, it is alternate history. Real Mosquitos did not do 415mph until they got two-stage supercharger Merlins, and they climbed to 28000ft.