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He tells Jonathan that he took advice from David Tennant and that he's eager to take on his mantle: "I spoke to David briefly, he said 'enjoy the ride'."
On the TARDIS, he reveals there have been some changes: "It's bigger on the inside, has different levels, other rooms including a library, [and is] a different shade of blue outside."
Finally, he says he's here to stay: "I hope to do at least another year, it's a wonderful part and I want to keep it."