I don't see where the numbers of members matter as Bosch achieved the OFT approval with just 300 garages it has to be about the way the scheme is administered.
Most of the people on the list of members at the moment are main dealers and the scary stories that are coming out about the way main dealers are treating their customers i would not want to get into bed with them on any scheme.
Having been and still am a member of the RMIF ofr some 15 years i have worked to their code of conduct and never had a problem, the only reason i joined the bcs scheme was for the back up and expertise of Bosch as a company.