Not a VW specialist, but I always go to Ladyroyd Garage on Thornton Road (and I now live in Wakefield). Not the cheapest, but they will not rip you off and tell them that Paul with the Camper and the red Rallye Golf recommended you to them.

I had a cab for years and they had it running sweet.
I'm not sure about anyone else in Bradford but there's a company called IVC in Leeds (web site here -->
http://www.ivcleeds.co.uk/ ) that I've only ever heard good things about.