Use
www.flyer.co.uk/directory/index.php for a list of the clubs.
Try 'Bristol' and 'Somerset' because BRS is actually in Somerset.
I believe the only PPL school left at BRS is Bristol and Wessex. Aeros have a base at Filton. Though if you don't mind the trek, Kemble is 40mins from Bristol City. Kemble schools can be found under 'Gloucestershire'. Hope this is of some use.
sB