Hello
We live in the Clun Forest area, so quite a few Clun sheep about here. We started with a couple of 2 to 3 day old cades that turned up in our fields and were not taken in by the farmer, we then decided that we wanted to keep sheep but pedigree was the way to go on a relatively small acreage. We liked the temperament of the Zwartbles sheep, having looked at lots of breeds at the Royal Welsh, and then found some for sale locally so got started with a pedigree flock. They are a lovely breed to own due to their friendly natures and as already said by smee the meat is excellent, they don't produce the best butchers carcase so you may be penalised at market, however they can be taken to a heavy weight without going overfat unlike many other breeds so one carcase can produce plenty of meat. Well marked good quality and well grown lambs can fetch very good prices at sales, so they always the opportunity of a few of the best breeding stock lambs making a good price for you if you have an MV accredited flock.
I spin and there is variation in the quality of the fleece, but am a bit surprised that Sally has found the fleece a has a short staple, nearly all of ours have a fairly long staple for a shortwool with a good crimp and have won and been placed in fleece classes against other breeds. Zwartbles wool definitely does felt but is a little slower to felt, it was a desired fleece by a local felting mill when it was operating.
We recently decided that we would start a native breed flock, we had to choose a breed that had MV accredited flocks due to keeping our Zs accredited so were fairly limited, this gave us both Cluns and Shropshires to choose from. Whilst Cluns should really have been the best option due to us being in the uplands of the Clun Forest in the end we chose Shropshires due to a more proactive breed society and the breed producing quickly and producing easily fattened lambs, they also have a good niche marked for grazing in trees. Clun lambs take longer to finish and our commercial farmer neighbour had stopped keeping them due to them having a narrower pelvis. However other local farmers still keep the breed, they also have a good soft fleece, although shorter staple than Zwartbles. The Shropshires have a good fleece too and the society is encouraging performance recording and hopefully the breed is developing to have a niche commercial future.
If you can find local flocks of the breeds you have shortlisted it would probably be worthwhile to arrange some flock visits to help you decide which breed would be most suited to you and your set up. There are plenty of Zwartbles breeders up in Scotland, I am not sure about Cluns though. I would also advise going to the breed sales to get an idea of the stock/type that does well.