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.
TEACH YOUR CHILD TO READ - busy bag spin and spell. such a neat idea! And Easton could be just like his daddy and carry a few nuts and bolts with him everywhere. just in case! Super Effective Program Teaches Children Of All Ages To Read.