The excellent Prestwick Flying Club has just added a Chipmunk to its flight line. It looks like they're hiring it out at a very reasonable rate too - £115 per hour. The guy I spoke to was really enthusiastic and helpful, so I'm going over there to get checked out on it and do some aerobatics!
They've got a website, which seems to be still under construction, but it has some photos and contact details. It's at
www.skylarkaviation.co.uk.