Probably not quite the right forum ... Pivate Flying / GA ?
(training related ... then maybe)
Stapleford is quite good, close to London and easy to commute to the city - Bus/Taxi/Central Line
Half the price of Biggin - but no official instrument approach, there is a nice VOR there
£9 for single i think X 2 for twin ...
free parking throughout day, few quid overnight !
EB