These Guys have a good reputation for all VW's and have been around for years (Hove):
pfeiffersgarage.co.uk
Ditchling ( Ex Caffyns staff) - took our Audi in but quote was similar to main dealer so went the main dealer route:
S.W Auto Repairs Ltd., Ditchling. 49 likes. Volkswagen specialist. Servicing and repairs centre based in mid Sussex. Over 30 years experience, family run business. We offer free pickup and delivery...
www.facebook.com
For camper related issues, below are very good (located in Peacehaven, on the coast road). They have experience all all types of campers so are not VW blinkered, they will 1st try to fix rather than replace!:
Stewart Mouland Motorcaravans, Used Motorhome Dealer based in Brighton, supplying Used Motorhomes for sale within East Sussex, including Swift, Elddis, Auto-trail, Chausson, Carthago
www.stewartmouland.co.uk
(+ (VW) SMG Cowfold, but sure that I saw your van in there having some work done whilst you were buying, as mine was in for service at same time, so assume there must be a reason for not wanting to go back)