Well, just after I logged off last night Korky obliged with a wee and a poo (both normal) and overnight he did another big wee so I think he's OK. I've decided not to bother with the vet as the trip in the heat would probably stress him out big time. We'll just keep an eye on him and make sure he doesn't get overheated. That said, its hotter than ever here today but the humidity that we had over the weekend has gone so it feels much pleasanter. I wet my hands before stroking Korky now (helps keep him cool) and we're keeping the AC on in the bedroom for him during the day while we're outside swealtering in the heat. The things you do for a cat!