Well, spotty has now gone and I'd just like to say a very big thank you to everyone who sent lots of calm vibes and love for us both. He went very peacefully and now should be with his bunny girlfriend who left him some years ago.
I brought him back home and put him in with my other rabbit for a little while so that she could see he was gone. They never really bonded very well but they could always see each other, sniff each other etc so I don't know how she will be without that interaction now. I will have to give her lots of love and attention and make sure she has plenty of toys to keep her occupied whilst I am at work.
Once again thanks for all your support.