I second the recommendation of Skipton Auto's, quite close to Huddersfield really. He will look after you and your car better than any of the dealers.
Otherwise, I can recommend a VAG / Porsche specialist in Sheffield, nr Meadowhall, called Statler, a chap called Steve owns and runs it, is very knowledgeable, and very hard working and very reasonable on price. He also rebuilds Porsche and Ferrari engines, transmissions etc... and always has quite a few exotic cars in. You can always shop, whilst work is being done.
Nick