Thanks for that, HamishDylan ... a rather more profound analysis than my simplistic view! And, of course, I am now monstrously out of date! Your Arms Plot observation is, of course, the killer factor ... I wasn't really aware of how that works. However, at Waddington in 83/4 we were getting a RAuxAF Regt Sqn with their captured Argie Hispano flak guns. Not sure what happened after that, as I'd moved on.