The reason we go o often is because my nan lives their and is getting on a bit and we need to visit her.

I doubt anyone would steal it, just being precautions. And I would not treat it any better than the rest of my cats, I love them all equally. The breed does not effect that.

I am happy to leave it alone with my cats, just aware different breeds need different things, and my cats are always fine to be left, they are perfectly happy with each other, but a siamese may be different in these circumstances.