On behalf of Kevin at Sussex Road and Race (and written with his agreement) can I contribute to this debate:
In dealing with the opening post, Kevin was employed by John Cooper Garages to develop the BMW Mini R53, of course as a trained mechanic he has a considerable knowledge of classic minis and whilst at Coopers he worked on clssics as well. When Cooper's closed Kevin set up SRR and at the start he would work on all makes in order to get the business off the ground, a business that was founded with the prime aim of doing motorsport.
SRR have for a number of years combined working on classic and modern minis, but it has become more and more difficult to provide the service they would like, on classics. As an example, many classics are failing MOTs due to rust, and SRR is not a bodyshop - local bodyshops have long waiting lists and SRR have been forced to either carry out bodywork repairs themselves or store MOT failures for months until bodyshops can do the work. SRR have space issues and have had to turn away this work recently. Then there is the quality issue: parts for classics seem to be made to a lesser standard these days and SRR are having to make parts that should fit, fit; or they are failing soon after fitting and SRR are having to do a job twice. A third issue is that classic minis are by their very nature getting old and when one job is done something separate fails soon after and the customer returns the car to SRR linking these unconnected events in their own mind (understandable in many ways), this involves SRR in carrying out extra, unpaid, work.
To sum things up, the real cost of working on classic minis has reached a level where SRR cannot continue to subsidise their owners, and at the same time SRR feels that charging the full cost would be more than most would be willing to pay.
Yes, SRR are heavily involved in modern minis, they are running four race cars this season; SRR also has a significant following from owners of these road cars and is having to make difficult decisions, caused by its own success, as to the future of the business.
Given these factors, and as a classic mini owner myself (two classics and one modern, to be fully honest), I can understand Kevin's predicament and why he has come to this conclusion.
I'm sad about SRR's decision, and I know Kevin is too, but he has a mortgage to pay like the rest of us!