Thanks everyone! I am very enamoured with his white chest and tummy - I think it's adorable, not to mention his little face!
I managed to get a nice snapshot from his digging video:
This morning was interesting. Hubby and I went downstairs to find him running a marathon on his wheel. The moment he saw us though he got a fright, ran out his wheel and then froze. We left him alone and went to the kitchen to make some tea. When we came back I peeked in the cage and the poor boy was hiding in his cork tunnel. I decided to partly cover the cage with a thin blanket. Hopefully he'll settle down a bit once he's used to everything. I think he probably had a good time exploring and running on his wheel during the night when everyone was sleeping but now that everyone is up and about he's feeling a bit less secure.