Probably a little bit too far north of Camden, I took ours to a VW dealer, Sheppards in Bishops Stortford (up the M11 2nd junction after the M25).
They did a really good job. It cost £298 for the 2 year (at 36000 miles) Long Life service using VAG approved parts, changing all the filters and fluids (including brake fluid) and the MOT. They washed my car and also lent me a brand new Polo for the day.
No fuss, no hassle, just a good job well done!!
So you probably won't want to drive to Bishops Stortford, but try your local VW dealer, I would hope they will provide a similar price and quality of service.
Oh and FYI the Local Audi Stealer wanted just over £440 for the exact same service!