Well there are loads of VW Camper engineers about on this side of Cornwall, not too far from you.
And, any good garage should be able to do it anyway.
However, try Volksweld in Redruth, 07807 355875
Rob Kelland in Camborne 07742 787082
Dub wise St Columb 01726 860370
There is a good supply shop in Redruth Retrodubs 01209 697290
I haven't personal experience of them tho as I always do my own servicing. It is very easy. If you fancy having a go yourself, perhaps we could get together and run through it here. Most servicing will only take a couple of hours tops.
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I am an Engineer. I will fix this!