Mr Moth,
I think most of the people who became Spitfire pilots went from Tigers to Spits, usually at about 30 hrs and many joined squadrons after about 10 hours on the Spitfire or Hurricane.
Had two fathers go that route.
Harvards were US planes and I never saw one in UK even after the war.
Talking of the Warbird Museum at Kissimmee, I was there last year. Many great planes in varying states of decrepitude as well as some interesting rebuilds. Visit somewhat spoiled by a guide who insisted that Vampires were famous for tipping over V1 flying bombs. (No I was not a smart Alec who argued in front of his customers but I did send them a polite email when I got home.)