If you want to fly desperately, and £6k is unafordable, then look at it from a slightly different angle.
Lots of people are flying different things, it just happens that the standard certified light aircraft is the conventional route, but far from the only - and most certainly not the cheapest.
(1) There are gliding clubs, where you fly as you can afford it, spend a lot of time around airfields, and instead of simply going for a licence are part of a continuous progression of improvement.
(2) Learn to fly a microlight. £6k will buy you an NPPL(M) course and a basic 2-seat aeroplane, which will then cost less than a quarter to run what a typical club Cessna will to hire.
(3) Ignore the JAR PPL (it's mainly a stepping stone to a commercial licence anyway) and do the NPPL(SEP), which will cost nearer £4k if you've a reasonable aptitude.
(4) Do (2), then if microlights don't satisfy you, move onto (3) where you'll get credit for most of your microlight training.
(5) Do any of the above, learning to fly in the UK relatively (note relatively!) cheaply, then if you want the group A licence, do a cheap course in Florida to upgrade later.
(6) Buy a basic PFA homebuilt for around £6k, then add another £2k to do your PPL in it. You're then £8k down, but own an aeroplane and can always get that £6k back if you give up.
(7) Do a course in Florida, then come back and add another £1k or so learning properly how to fly in British airspace.
There's nothing wrong with the "mainstream" route (apart from the cost, which is largely to do with the UK economic environment - don't blame the schools), but don't let anybody brainwash you into believing that it's the only route.
I'd suggest, seriously, that you go and spend a day or so each around the nearest glider and microlight schools, buy a lesson or two at each, and then decide how you feel about spending £6k.
G