We’ve used Simon and his team at SPS Bodyworks for a number of things ranging from our MK1 Golf to various bits on our Californias - http://spsbodyworks.com/
He’s very good, reasonably priced and also a massive VW enthusiast. And right next door to VW Live for any of your mechanical needs! SPS and VW Live are in Wadebridge.
KJ Rule are Cornwall’s approved VW bodyshop/repairer and have a good reputation, if you’d like another option.