I know there are several companies doing mobile fitting and RAC do breakdowns but this is new to me. I needed a couple urgently for a failed MOT and stumbled on this while hunting. I did find a few companies that will do tyres here but most seem very expensive in my area then stumbled on this.
Gave them a ring and they actually didn't seem to know much about it but after a check with someone else came back and booked an appointment then called back to sort the tyres I wanted out. For the record they could of come within 90 minutes but wasn't convenient.
I went for the cheapest as I'm selling the car in the next month, £60 a tyre for 17"/225/45 cheapos is very fair considering they come and do it on the drive and its RAC not Jo Bloggs. They did have a fair few others up to £160 a tyre.
Areas covered according to website, i'm in Warwickshire and they have me covered, we are sort of West midlands regionally but not from a county point of view so seems the list is not 100% strict. Asked the bloke and he said they will go anywhere within reason so probably fair to say north of Devon and South of Manchester should be covered.
Kent (M20 Corridor)
They will do it for non members £29.99 which I guess isn't that bad.