Well, the vet is a well respected one, used by almost everyone in town and people from miles away. If his owners are caring, they will be the first port of call.
And I'm almost sure they will contact any nearby known breeders to see if he's recognised.
It's in Herne Bay, Kent, Gail... I'm not sure what his colour is but if I get a chance to see him I'll let you know.
I'm afraid I have to agree with MM. We live in such a throw away society, people think nothing of spending hundreds on a kitten then getting bored 6 months later. We rehomed a Ragdoll a month or so ago that wasn't wanted anymore. And I've seen so many Siamese in rescue and so it's going to happen to Bengals.