Thanks everyone it means a lot to read your messages
I changed the title earlier, and was going to say what happened, but I just couldnt. The vet phoned first thing this morning and said that although he was still with us, he hadnt eaten anything and she said about his breathing being bad - she thought he was in heart failure, probably due to secondary tumours elsewhere than his kidney - and that a scan was only going to tell us that there was a mass of some sort, which we already knew - and there wouldnt have been anything we could have done. I think I knew that really after seeing him yesterday afternoon, I knew he wasnt going to get better
Anyway I went straight down there and bless his heart, when the vet took me in to see him, he got up and went towards his food bowl, my heart lept as I thought he's fighting, he wants to eat, but he didnt really, he just sniffed at the food and came away from it again, and he looked so frail and sick. Luckily he still had the drip in so the vet could just put the anaesthetic into that, no struggling to find a vein or anything - so it was very peaceful and he went to sleep in seconds.
My gorgeous George taken about a year ago.