Biggin Hill in the late 60's early 70's - yes. My next door neighbours dad was ex RAF thus we went there a great deal. Seeing (and hearing) things like the Electric Lightning was also something to behold. I think without a doubt though the piston aircraft were, and still are the main attraction for me.
'Favourite aviation topic' - nothing specific - anything old and interesting really that has a propeller. Through our Historical group I've been lucky to meet some veteran pilots - Kelly Gross, Russ Kyler for example, and to hear their stories is something quite special. When you realise how long some of these pilots had to stay in their planes on missions and remain alert - that sort of thing amazes me.