Thanks for the replies. I didn't realise there were no airworthy Stukas left. My brother does know a bit about planes so I believe him when he says he saw one.
Shackman - are you saying you saw them as well?
Anyway, here's a nice clip of Me109 having a relaxed time over Biggin -- and it's not often they can do that.
www.youtube.com/watch?v=JGhMGQst4lo