The Doctor did indeed have a fairly good idea of when to visit Earth, despite his often haphazard landings, and he was thankful to say that the decade in which they were currently trapped was one of the better ones.
At the mention of Adric, however, he seemed to withdraw again. He lowered his gaze to the sidewalk and swallowed against another unwelcome swell of emotion. "We did, but ... Well. It's complicated. I don't like to dwell on it. Not really. It was a long time ago for me. I must have traveled with a dozen other people since then."