Coming in here to wave, "Hi"
I too love my Borerays. Very much hoping to get some ewe lambs this year and still not giving up hope of being able to find a Boreray ewe for sale in north Scotland that I can tup this year. Boris in my avatar produced 2 gorgeous girls lambs with a Shetland ewe.
I've mostly wethers since I'm keeping them for fleece - I'll be rooing those that shed and hand shearing those that don't. The undercoat is divine - when I collected all the fleeces for the Boreray project and we realised just how special the undercoat was I hand separated around 12kg of it (that's the undercoat weight......) while Natural Fibre Company were experimenting with a way to do it in the mill and saved me from having to get the last 8kg done by hand. They sell the undercoat as a laceweight yarn, blended with Soay and sometimes a bit of very fine Shetland.
The aran weight yarn they spun from the whole fleeces is actually very nice indeed. Fantastic definition for textured stitches and cables. Not a 'next-to-skin' yarn but people knitted a variety of things. There was a limit on how much anyone could buy because the demand was so great from around the world.
Natural Fibre Company is always interested in buying more Boreray fleece - they are a registered Organic mill though so you can't have used pour on fly treatment in the 2 or 3 months prior to shearing/rooing - not sure of the exact withdrawl period.
Yes, it is a fleece in demand from hand spinners, but some spinners are pretty picky about the quality of their fleece - if you're not sure what makes a good hand spinning fleece then there are some links and info on this page
http://www.woolsack.org/AssessFleece