Did some a few years ago - doing was the main cost! I like Nicki Port for being so helpful and having more eco friendly processes. But you do pay for it.
Other one was Devonia - are they still going?? I hear something different every time they are mentioned. The fleece came back nice but the skin was very thin and had a few nips out of the edge. Fine for me but not for a perfectionist buyer, for example.
I tried rabbit skins myself, ended up with rabbit planks
I did come across a Wales-based taxidermy company that sold tanning kits, but didn't get around to buying.