Hi Zeddie,
Light Sport Flying Club at Wycombe Air Park may well be a good option for you as you live in Luton. They operate four Eurostars and offer training for the NPPL (M) licence. The way it works is that you pay for training by the hour up to solo standard and then buy into a syndicate to continue the training, paying group wet rate for the aircraft plus an hourly rate for the instructor.
Have a look at their website
http://www.lighsportflying.co.uk