Well my first experience of needing some assistance came about last week. So I dropped the car at BHP (nr Aylesbury) for a battery change (it'd let me down twice after not being driven for a few days), an investigation into whether the tracker may have been draining it unduly, a new set of mats (whoo-hoo!) and sourcing / "installing" a trickle charger. Parts came to £430 (inc VAT) and a grand total of 3/4 of an hr of labour = £51 + VAT (labour rate is about £68 ph if I recall). I mean, how many main dealers - regardless of brand - would charge you so little when they could've easily mugged me for a couple of hours!? AND, he gave it a quick wash too.
Neil at BHP was very accommodating, happy to talk Lambos, Ferraris and all the rest of it, showing me what they had around the place. Thoroughly professional, welcoming, decent and all-round although my experience is so far small, I'm more than happy to recommend them - and indeed have to a couple of local acquaintances.
As an aside, I asked for a guide for servicing - about £550 from memory was his response, which strikes me as quite decent (I may proven a fool naive fool now!).