BMW Specialist Workshops

I'm taking delivery of a 2001 330ci in a couple of weeks, and have to start
thinking about where I'm going to get the thing serviced. I really don't
fancy lining the pockets of over-priced joker main dealers, so can anyone
suggest a good place to go in the south of England (I'm actually around
Southampton, but don't mind travelling a reasonable distance)? Needs to be
trustworthy, respectable and reliable, and of course not look too out of
place on the service history.

To the excellent Badger, if you read this - where are you based? Anywhere
close-ish?

Many thanks in advance.

Fred