I recently used Transcal, who did a fantastic job fitting leather seats back and front. They have a base in Bristol and Livingston. We visited the Bristol depot to decide what we wanted. It took about three weeks for the leather covers to be made up. The firm arranged a day to come down and remove the front and back seats and returned two days later to put everything back. They did not charge extra for coming to our place. I believe they travel all over the country fitting seats although you need to check this out. The only word of warning is do not switch on the electrics while the seats are out, because the airbag warning light comes on and you have to get this reset at a VW dealership. The company also deals with private jets and yachts, if you happen to have one lying around needing a refit.