Thank you everyone. Just got back - the vet's booked him in for a GA on monday as he thinks he's got an abcess in his mouth and may need a tooth out. Apparently his back teeth are all quite sharp too. He's had an injection to get his tummy moving which must have kicked in pretty quickly as he was eating the newspaper in his box all the way home :roll: and he's now having a little chew on a parsley bell.
Really worried about monday now. He's too big and old to have a GA. :shock: