Loads of positive feedback about these, but I doubt I'd go again. The biggest issue I had was that I'd arranged a day to work over at the Leeds depot while my car was having the auxiliary belt and 36k service done. I'd booked this weeks in advance - phoned and confirmed with them two days prior that I would be turning up on the said day. Dropped my car off and got a lift back to the works depot before receiving a call at 3pm saying that my service had been done - but the auxiliary belt kit hadn't. Asked why, they said the supplier didn't have one in stock and they hadn't pre-ordered one, just in case I didn't turn up! It's a auxiliary belt kit..... I'm pretty sure that they would have had another car to put that on within a week or two? Plus, it's hardly the most expensive part to have sat on the shelf.
Fast forward a couple of years and on a rolling road day, I was told that my cam-timing was well out and that I could get it redone there 'at a good price'. Erm, no thanks.
Probably very skilled individuals, but my personal experience of their customer services leaves a lot to be desired. Been to Birchdown every time since and never once looked back.