I will ask around to see if anyone knows where they were woven, the blankets do seem very similar. Somehow lurking at the back of my mind is 'in Wales' followed by Lancashire but will get back to you if I find anything definite. I do think they were made for the Armed Services so the Imperial War museum might have the answer. I always look in the charity shops in the hope of finding them, they are scarce these days though.
Just think of all the pleasure they give to us in their second lives!