Hi again everyone,
I just wanted to say thank you for all your advice, a bit more to KittyTyme, as I think it was a bit of claustrophobia. We had a door on his litterbox, we've taken it off and no problem, but thank you everyone for all your suggestions, I haven't had a baby kitty since our youngest was a baby and it's so nice to have help from other owners. I will be posting The Pet Diaries Part IV soon so keep an eye out. A quick note, because he's still a baby I thought it was safe to change his name, Diego was different but I've always like the name Kai, so Diego is now Kai. Thanks again for all your help everyone, you're the best!
All the Best Cassie :-)