Hi,
I am in a similar boat (I haven't quite reached a plane yet). From what I have found out, I would definitely suggest that you get the theory sorted first.
Derek Davidson runs a 5 day PPL course covering the theory and all the exams. Numerous threads HIGHLY RECOMMEND HIM and his name seems to crop up quite a bit on 'Google' searches. He advertises in 'Pilot' which shows contact details. He has an answerphone on 01202 315875. I haven't yet spoken to him but hope to arrange a meeting soon.
A small firm called Debenair has also been highly recommended for the PPL flying bit. Their link is
www.debenair.com . Certainly very cheap and I'm told the training is first class. It is a small family concern. I am hoping to go out there in Feb/March next year.
Hope this helps although I guess you will be deluged with recommendations.
Greg