The Doctor emulates London's greatest detective, Sherlock Holmes. A neat little nod to Steven Moffat who writes for DW and "Sherlock" and a nod to the fourth doctor, who also pulled this stunt in the same time period in a classic who episode.
You know, this picture is really perfect. The Doctor is immediately interested in who Sherlock is. Sherlock is trying to deduce him, but having some trouble, given he is an alien and all. Clara is waving to John, trying to be friendly, and of course John picked out the girl of the group to pay attention to.
Sometimes I tell myself I'm okay. I repeat it like a mantra. I'm okay. I'm okay. I'm okay. I'm okay. Because I'm afraid if I stop, even for a moment, I will drown in all the reasons I am not. #doctorwho