Sorry BEagle,
Flight Instructor is DEFINITELY to Americanised for me and I will NOT be using it in normal use, no matter what our masters say.
N.B. Personally I don't normally use QFI myself for civvy instructors, but I get a bit fed up with pedantic people jumping down the throats of those who do. The odd time is OK, but it seems to happen EVERY time someone uses the term.