@plumseverywhere Thanks for your help, we did end up phoning Animal Health and they were very helpful. In the end, we didn't need the details for the original owner of the goats, and they weren't as strict as to require movement documents.
All they are asking is that we register and tag the goats with red tags, showing that we now own them, but they were not born here.
@Roxy You were spot on with your advice, that is exactly what has happened. Animal Health were only to happy to help, and they were happy that we were now making the goats legal. Give yourself a pat on the back from us!
@MGM We're not planning on spinning the fleeces. We're new to the whole thing though and are members of Freecycle, so may offer up the fleeces on there to see if anyone else can give it a go.
Thanks everyone for your help, you've been fantastic!