A bit of spot cleaning pee tonight and it's sorted. The mountain at the front was pee'd on substrate he had pushed out of the cage - clever boy. He had pee'd in his potty as well which was why it smelled inside the house - so a lovely mud pie of pee, bits of sand and cashew nuts. And no substrate left in that room. So replaced it with some from the play cage (smells of him and cleaned the potty and added new nuts next to the potty - the idea being to encourage him to hoard them in the masses of space in that room, in the substrate, but Newt pouched the nuts and buried them under his nest instead
. Anyway all easily sorted without too much disturbance.