I bought a home sausagemaker kit at a charity shop last month - unused with some sausage casings too and have been having fun making them for my husband who loves 'dogs'.
As he doesnt like spicy food much I just make them with plain minced belly pork and no additives apart from some salt and pepper - no binders or fillers at all.
Sausage skins and sausage making kits are available in UK but the fancy stuffing gadgets are fairly pricy.
I did find a small mincer with sausage stuffing nozzles cheaply at
www.weschenfelder.co.uk Though they do mainly push the more professional machines on their site, their household mincer is only £16.95 and comes complete with sausage-stuffing nozzles! http://www.weschenfelder.co.uk/produ...roducts_id=290
They also sell a variety of casings.