So it's not just just the KF spanners you have to watch out for - recommended independents only for me these days.
Very true. I've usually got a decently quick car, and it seems to tempt garage staff into giving it a wee test run, "just to check everything is OK, sir".
The two times I've had my cars into a national chain (one tyre, one main dealer), my cars have been thrashed.
After dropping my then pride-and-joy off at the tyre place opposite Flying Ox Towers, I see the car absolutely hooning down the main road about half an hour later. Garage denied this having happened, despite me pointing to my living room window from where I watched their chicanery. Never used them again, and in a totally unrelated event the garage burnt to the ground about 10 months later.
Second time was the same car, in for 4 new tyres and brake pads. Spanner monkey decided he liked the look of it and took it for a spin. I ended up with a very sheepish main dealer manager explaining that my car had been driven into a skip, and they'd like me to put some money towards the repair because the front end required a special order. I don't think he liked my reply.
As mentioned above, it's now goodgaragescheme.co.uk for the big stuff, my driveway for everything else.