"Well," he says, taking a seat and removing his coat. This is where he has to be really clever. "I surmised I was looking for an intelligent Englishwoman with a cultivated air, given your accent. And I can spot an English person from a mile away. There's certain homogeneous traits in bone structure and the like. At first I thought your eyes were blue or grey, but then I realised they're green; that's the result of interaction of multiple variants within the OCA2 and other genes, most common amongst people of Northern and Central European descent. Little things like that."

He glances around the cafe, "Of course, there's only a handful of people in here that could match the very basic description I had to begin with. But like I said," and he turns back to face her again, "I'm very good."

At lying through his teeth, which he's had a lifetime of practicing. He wonders whether that will be convincing enough, although he's ready to provide more if questioned.