I've used Dalgleish for special weaves and am very happy with the fabrics, and would use them again without any hesitation, for specials they usually weave it single width for smaller runs, only going double for longer lengths.
But I'd have to say if it is a special weave you want, then the way it works is simply that you will have to pay a little more for it. Paul if you want to ask anything from me, who at least lives this side of the pond, and has dealt with them, you send me a message!!