Some really sound advice coming your way in this thread OP. To add to the batch of contributors, I'd say the true cost of ascertaining a PPL is around ~£8-10K factoring with all the overheads associated ( books, maps, ground exams & skills test, RT licence, QXC landing fees etc).
My credentials : I'm a recently qualified PPL'er (well August 2013 to be precise). Also from the Midlands, took me 8 months (part time) alongside full time employment to get my PPL flying ~4-6 hours a month. All in all my PPL cost me £8,200.00. I did it in 55 hours in a C152.
I'm assuming you're going to be doing your PPL full time (Going all the way to CPL+ or?) if so then I believe your chances of gaining the license within the minimum hours is highly feasible, provided you do your homework & exercises due diligently of course
If you need any more advice feel free to PM me of course!
P.S: If you can, please go ahead & get acquainted with Wolfgang's masterpiece -
book...thank me later.... good luck