White Waltham probably has the best club atmosphere near London, but the runways are like a fairground ride (I was thinking of joining a group there, which had a prop strike) and the grass turns into a bit of a bog over the winter.
I keep a PA28 140 at Booker (£144pcm) outdoors and the BAFC is has nice folk there but, to be honest, isn't a patch on W/Waltham in terms of the club atmosphere. A big attraction is that there are no after-hours restrictions on flying, if you are an owner.
Denham doesn't have much of an atmosphere and there are restrictions with out of hours flying which, during the summer, would really irritate me. I didn't like Elstree, notleastofwhich because the approach would have involved me flying over a school I was expelled from.
My solution was to keep the a/c at Booker and drink at White Waltham....