I've got a bunny named Clover too! Your bun looks like a sweetie.
Some rabbits can be very territorial over their cages. Try not to go in unless you have to. Try and do the cleaning when she's out and about. If you do have to go in when Clover is inside, move very slowly and start off by just...
I don't know anything about the legalities in your local area, so I'll defer to missyscove's knowledge there.
Your rabbit does look awfully young...not knowing the exact breed will make it difficult to accurately determine an approximate age, but if I were guessing, I'd say he is four or five...
You mentioned you bought a new type of food...are you still using that or did you revert to his previous brand?
Also, did they check his teeth for any problems at the vet?
Oh I was not expecting to read this...from the highs of the show to the lows of a very special bun's passing. I am so, so sorry for your loss. I loved reading about and seeing pictures of Dobby. My very heartfelt condolences.
So terribly sorry for your loss. The fact that you gave this little guy a great home and the best care possible is all you could do. Making sure he was safe, loved and cared for was all any bunny could ever ask for.
I know it stings right now...when my buns have passed, I always went through...