I only use the VW dealership. So far they have been the cheapest and most helpful. They even recognise my voice and know my numberplate
Parts you should buy from the dealership:
Number plates - £6 each
Number plate holder £8 each
Body pannels if you can find them and afford them.
Ive only used GSF three times if that?
vacume piping (thumbs up)
Gear linkage repair kit - stay away. They handed me a mk1 kit and the quality was crap so in the bin that went!
euro parts for a front big bumper bumper - crap
Most genuine parts have been off other dubs and dealerships.