If you’ve not seen The Bells of Saint John, the first of part 2 of season 7 of Doctor Who then this post contains spoilers.
For the rest of us; this post is just speculation.
Here’s the prequel to The Bells of Saint John; make sure you catch the girl’s name.
Run you clever boy and remember, 123.
That was how Clara was told to remember the wifi password. She got it wrong, though, and typed 124.
In her diary/travel book some years are missing; 16 and 23.
The question is; is anything special about the number 23? Is she the third Clara? Or is she the fourth?
Doctor Who first aired on November, 23rd, 1963 at 5.15? Is the 23rd the reason why 23 gets some attention?
Or is there nothing here but ghosts? What do you think?