W1ld,
If you haven't done so already, get down to your local WH Smith and spend a few quid on 'Pilot' and 'Flyer' mags and check out the Ads in the back. Many flying schools have their own websites now but ones that haven't will still send you their course details through the post. As well as the UK, you will find adverts from Europe, Africa, Australia, NZ, Canada and the US.
Happy browsing