Hello,
I have used Jason who is the owner of this company based in Wantage.
https://jasongreenmechanics.co.uk/
A little outside of Swindon, but he is an enthusiastic VW garage that always seems up for a challenge, and is very sensibly priced. Regarding parts I would be sourcing the parts and asking Jason to do the mucky bit, the knowledge on this forum exceeds I would think all but one well known garage.
Things like the fuel pump will not cause you any worries to source with the knowledge here and just get it posted to him. But servicing / maintenance / body work is not a problem at all.
Our "odd" vans certainly do not put him off.
If you do contact him, mention Dave with the purple van, he will know where this recommendation has come from.