Hello Smee, we have taken some Zwartbles skins to Nikki Port in Herefordshire in the past, this is probably your nearest tannery, although if you are posting them the distance doesn't matter too much. It would be worthwhile contacting Nikki, I know she told me that Zwartbles tend to moult fairly early, early September time, but I am not at all sure whether they would have finished moulting by now or not, can't say I particularly notice much moulting on the sheep though! If you do take the skins you will need to print of 3 copies of a Defra form, you give one to the abattoir, you keep one and the other goes to the tannery with the pelts. You need to be prepared to salt the skins to cure them, this needs to be does as soon as possible, hopefully the abattoir will put some initial salt on them, and it takes 3 weeks or so for them to cure before they go off to the tannery, Nikki emails an information leaflet and will explain everything.