[Sam's eager, the Doctor has to give him that. He's rarely seen anyone buttoning their shirt any quicker than that. It's kind of fascinating to watch, but when Sam speaks, the Doctor's attention is thoroughly distracted. How would Sam know - oh right. That show on the telly.]

Blimey. You're a real fan, aren't you? [It's not like he's prone to using the displacement detector on a regular basis. He uses it hardly ever, if fact. Which is why he doesn't have it on him; it's probably still in the pocket of the coat his Forth liked to wear.] Haven't got it with me, sorry to say.

[And his attention is distracted yet again. A gun? Suddenly he's even less enthusiastic about the thought of Sam coming with him; the one thing he's always appreciated about the British police force is that they don't make their members carry firearms on a regular basis.]

Oi. If you want to come with me, you're leaving that. [He gestures at Sam's pocket.]