I dont know if this has been done or suggested before.
But i'm going to put it in anyway.
The MR2 forum has a section for dealers accross the UK, it subdivides by county and lists dealers and 3rd party garages.
The forum enables members to post on it their service type,
satisfaction, costs, what was done etc. People could browse this to make up their own minds on a dealership/Garage by its track record and this may help ease the slagging matches that sometimes
pervade this BBS.
Have a look for yourselves and see what you think.

http://www.imoc.co.uk and go to the dealers section.

 

Be most interested to know how the webbie handles potential libel issues.