B-man, I think the answer is that there is no airfield which is quick to get to from central London by public transport
. I have tried most of them (by helicopter and fixed wing) and they usually involve a flight, a (road) taxi, a slow (zone 4) tube or a fast train and then a fast tube polished off with another taxi or a walk. I include Battersea in this which is far too overpriced and inconveniently located to be of any further use to me.
My current favourite is Denham
. Nice people, good attitude, reasonable transport link but still not in possession of fantastic links.
Can you imagine how succesful a new GA airport would be if it had a rapid and conveniently placed tube stop?
We can dream,
SB