I own the yarn stock that came from D C Dalgliesh the base yarns are used by a number of tartan weavers and there are a limited number of suppliers. D C Dalgliesh were still using shuttle based looms for the in house weaves, the weaves produced by the contract weaver (who I'm working with) use a Dornier rapier loom. There are also slight variations in the work done at the finishers.