Just chippin my 2 penny-worth in. I learned to fly in the UK but outside the London area. I live in central London and have looked at quite a few airfields in the London area. I reckon Stapleford is an excellent choice - straight along the Central Line, then a £7.00 cab from Denham. Friendly, professional folks with high standards, good facilities and generally well-equipped. OK it's not the world's greatest runway but that makes it all the better to learn from. Good luck!