Since there was a question about sizes, this page about Point Blankets is a good, quick reference, especially if you can't get a hold of other books. Remember to double the length indicated to derive the "pair of blankets" size. Ex. the one point at 46 inches long is about 8 feet as a pair or double.
You can figure the half point as in between the point sizes.
Contact me for some bibliographic references on blankets and weaving in England (Witney, Oxfordshire, etc).