I am so sorry Dave. I can imagine how you're feeling. I still have a cry now and again after we lost SmokeyPokey just before Christmas.
But I think it was for the best, and a peaceful end. As you say, if only we could guarantee an ending like that for ourselves.
I try to concentrate on the lovely life we gave all our cats, and you did too. Your darling Lily Puss had a super life in your care, and that can be a comfort.
Sending you a hug and our sincere condolences.
Eliza xx