Canada's one outbreak of foot and mouth disease, back in the '50s, was caused by someone bringing in an illegal sausage... since sheep are major carriers and there were the two agricultural holocausts in the UK so recently, F&M and BSE, I think the timing may still be considered a little premature.

Frankly I would rather eat native sheeps lungs if I had to- but I can't imagine them adding much to the haggis anyway. Even if they are still used in Britian, those could be left out for export.

BTW, cooking does nothing for BSE. It's built into the protein.