I would venture Clacton although this is only based on their advertisements and no practical experience. Cheapish PPL and ability to do it on a Cub, should you wish. The farm strip course looks a hoot too.
<a href="http://www.clacton-aero-club.uk.com/" target="_blank">Clacton Aero Club</a>
Might I also suggest using the Flyer GA search database and making a few phone calls?
<a href="http://www.flyer.co.uk/directory/index.php" target="_blank">Flyer Flying Club Search</a>
Bling bling.