Who are you expecting to steal your ped; the neighbour you've asked to feed it?

Personally, if it ends up forming a close bond with your other kitties, I would leave it at home with your other cats so it feels more secure, or send them all off to a trusted cattery together for their own mini holiday. Also, I would consider not going away to Wales quite as often anymore, as, I believe Siamese are quite needy and love the human company, so might get disturbed by your regular trips away (these are the kinds of sacrifices us ped owners have to put up with sometimes

), whether you take it with you or not.