In search of Ryeland fleece - medieval history on the hoof

My latest quest is for Ryeland fleece - I have a contact consulting the flock book for me to track down a source for me!  Why am I pursuing Ryeland fleece?  Well, my current project is connected with Tretower, a historic manor house north of the Brecon Beacons, and I am looking to use some wool in the felting process from a breed of sheep which would have been familiar in the house's heyday between the 14th and 17th centuries.  The Ryeland sheep (named after the rye-growing area around Archenfield in South Herefordshire which was its heartland) was developed by the monks of Leominster in the 12th or 13th century, producing a remarkably fine wool which was greatly in demand - its value was such that its alternative name was 'Leominster Ore'.  As a high-status dwelling in the later Middle Ages, only a relatively short distance west of Herefordshire, it is very likely that Ryeland wool would have found its way to Tretower, which is why I am keen to use this breed in my Tretower project.  Few breeds of sheep in the UK now, other than the 'primitives' such as Soays, can trace their origins back as far as the Ryeland - the 'improvement' of native breeds which resulted in the breeds we now have was largely a product of the 18th century onwards, and continues even now - as with, for example, the Beltex!