Update:
Booked full service and MOT online, all quite easy. Had a call and email to confirm very soon after. Car would be collected between 8 and 10 next morning.
Young lady turned up soon after 9am. Left a car in the drive and drove mine away. I was pleased that she took some time to familiarize herself with the MV6 rather than just driving off.
I had an email saying that the car was at their service centre nearby, it was an industrial/retail area with quite a few garages like Kwick Fit, ATS and others.
A call from Service Stop in the afternoon saying that a duff tyre had failed the MOT, £85 for a new one. Fair enough, I knew that the tyre was loosing air.
Another call, asking if it would be ok if the car is not ready until next morning as they needed to order the tyre. Ok, no problem.
Email and text message asking me to go online to pay so that car could be released. Amount payable was as stated plus the tyre.
Car delivered back by a young man, with MOT and some advisories.
Summary: The service works, obviously the actual work is subcontracted out and therefore is not particularly cheap, but I needed service and MOT very quickly, so fit for purpose. The Service Stop people are very professional and polite, unlike many garages !
My only quible, and it is a big one is this. I buy good quality expensive tyres. I've had too many bad experiences with chinese cheapos, noise, rumble, bad grip etc. The replacement tyre was one of the cheapest you can get, it was made by BTG. If a car has Avon ZV5s all round, why would anyone think that some cheap tat will be acceptable to the customer ? Plus £85 for some cheap tat that can be got for around £40. I went for a drive yesterday, and it's not too bad, a bit rumbly, but the tread is totally different and I just don't feel confident. I'l probably change it.
I would use them again if I had to, but I would not just say "yes" to tyres etc, I would want details first.