Not sure where there is a list, but Bournemouth is one. 4 schools to choose from. Anyone else fly from an airport with a CAAFEU?(CAA Flight Examiners' Unit, or did I see they have changed the name of these?)
Ask the school - "Do you employ Send Clowns?" and if they do then they are a good school
Well, a little more seriously, look to instructor/student ratio, payment scheme (in arrears is best, can't lose anything, but if not be wary of making large advanced payments). Pass rate possibly, although statistics can be deceiving. General chat with staff and (away from staff) students to get a feel is probably most important. If you're happy, you will work hard , enjoy your flying and fly well.
Best of luck