[There's another long pause, where he's pretty much staring at the screen trying to figure out what this Ter...Terry...whatever the person's typed.]

Aye, well, if you're asking where I am right now, I'm in a cave. There's a planet we'd gone to after everyone else went home and we're trying to find out what's down here.

[He hesitates for a moment, trying to decide if he wants to go into more detail, then opts for a question instead.] Look, this may sound daft, but have ye happened to see a man about in a pinstriped suit and hair that sticks up a wee bit oddly? Calls himself 'The Doctor'.