learning to fly at elstree
My recommendation would be to look at Firecrest Aviation at Elstree. They have been going a long time and have a good collection of aircraft and experienced instructors. Book a trial lesson for under £100 and then have a good look at the costs for getting a PPL - the website quotes 45 hours for around £7000.
I would definitely advise that you choose somewhere which runs an active flying club and the best way to find the right club is, as other people have said, to go and visit them and chat to the instructors. Wherever you decide to learn - enjoy, it's the best thing you'll ever do !!