Hi darrylpeters,
I currently live in Northwest London - about 3 miles from Wembley - and I am doing my PPL at White Waltham Aero Club in Maidenhead Berkshire. I certainly recommend them.
http://www.wlac.co.uk/index.htm
There is a flying school in Denham which is very close to Uxbridge. Below is a link to their website.
http://www.egld.com/tpc.htm
Hope this helps.