It's getting harder for the old "back street" garage these days. More and more cars now require expensive, specialised computer equipment to just service them (mostly to reset the service indicator!)
The only way is to specialise in one make, VW/Audi or BMW for instance. When a car gets a few years old, and out of its warranty, many people may not want to pay main dealer (or "main stealer") prices, but will then seek out a cheaper specialist, who may have the correct tools and do just as good a job.
I've thought about specialising in classic cars, or anything pre 1990, but starting from scratch is going to be a right pain if I do...
