Which is what I already said.;-) Not really. What did you mean?
Surely it would be afforded the same level of protection as any other species? If it had been an escaped porcupine or something (unlikely I guess on a slipway in Wales?) that might be different, although I guess any animal cruelty laws would still apply if any physical harm occurred directly.
I suggest you read the RSPCA page although, that does not cover, clearly, wildly occuring, non native species.