Well, I finally got round to sorting this out, and found a bit of a gem in the process
I'd originally booked in at Crawley Down Group, who are listed on the VW site as a main dealer franchise. Booked it online, selected the "courtesy lift" option (which I'd used at Coulsdon VW last year), picked a service (which was cheaper than a few specialists I'd got quotes from), all good.
Turned up on the day...no record of the service being booked in. Show them the email confirmation; lots of confused looks. Told me they don't do courtesy lifts. Basically wasted 2hrs of my paid time to mess me about. Piss poor showing all round
Eventually I ended up booking in with these guys, just outside of East Grinstead on the A22.
http://www.adautotechnik.co.uk/
Couldn't recommend them highly enough
Two proper sound guys working there, let me poke around under my car on the ramps while we chatted about VWs, exhausts, tuning etc. Both have their own high power road/track VAG motors, and clearly love what they do!
The oil service, brake fluid change, diagnostics check and a general inspection was £200, which is spot on from what I've seen.
So yeh, I'll absolutely be using these guys again in the future :)