Hello mate,
Firstly, welcome to the Beautiful South!
I was in a position similar to yourself recently, just wanting cheap flying and after visiting several flying clubs and getting their rates, then analysing on an excel spreadsheet (yeah I know, sad!) I found Blackbushe Aviation with their Gold club membership by far the best value option, provided you fly a couple of hours a month on average over the year. Add to that the great facilities at EGLK and the fact it’s a friendly light a/c-positive airfield (vs Biggin that are becoming more and more focussed on Biz-jet traffic) and IMO it’s a winner. Drop in when the new cafe is open (in the next week or two) and take a look for yourself.
Happy flying wherever you end up!