First off - do a search on this Forum, this very topic has come up several times over the past couple of years with a lot of sound advice in the various responses which still stands.
I may be biased but my choice for my PPL was Coventry, it's a big airport environment with full ATC etc, and just busy enough to keep you on your toes. If you learn there then you'll be quite confident to go into any of the larger airports with your PPL. Plus 24 hour opening and ILS/radar mean that you can move seamlessly onto your Night Qualification / IMC if that's the way you choose to go later on. There are several training organisations at Coventry, check them out. My choice would be the Coventry Aeroplane Club (trading as the Coventry Flying School). Why? Well it's member owned and run (so it's not there to generate a profit for it's owners), has an active social side including a great bar (!) and you get to train on airways equipped Warriors which are only a couple of years old.
Go for it and good luck!