Thanks everyone. We couldn't find him this morning and eventually found him under the radiator in the dining room which is usually reserved for when there are workmen in. He isn't 100% but he has eaten 1/2 pouch felix beef in jelly which is one of his favourites. I offered him some chicken - partly so he would take his pill but he won't eat it. I wonder if it smells different to him as it's free range corn fed rather than regular free range. I will see how he goes this morning and speak to the vet. I will put some SEB on his food later. He hasn't had the nausea and sickness for months. It crossed my mind that when a cat has a particular illness, we tend to put everything down to that but it could be something else and he is just having an off day - he has been eating more than all the other cats for months now and has even developed a little paunch so it seems quite sudden. Yesterday he even had his usual 2-pouch breakfast and a couple more during the day. I will just keep an eye on him.