I tend to use independent garages and 2 immediately spring to mind from the UK (and one from NZ)
When I had my SAAB 9000 the independent (Simons SAABs) near Basingstoke lent me a 900 turbo, now it was old, decrepit and nasty but what a hoot to drive, I spent the whole day hooning around roundabouts and used 2 tanks of gas even though I only lived 40 miles away. Sorry about the tyres Simon!
Then a few years before that I had an Allegro 1500 (yes I know - sorry) and stripped a plug thread, so while they were sorting that they gave me another Allegro (an 1100)
What a miserable piece of shite that was, rusty, dirty and smelly, to make matters worse I had to drive it from Gosport to Chichester to pick up the kids from boarding school. This festering pile of excrement among all the Jags, Volvos and Mercs. Made me proud!
Finally the place I use in NZ (Burger Motor Works) mainly deals in BMWs Mercs VWs etc so he always has a snotter BM for me The last couple have been a 5 litre and a 6 litre 7 series (usually none of the toys work and on the last one the alternator/waterpump belt broke on the way home)