The BBC has released this morning another shot from the Christmas Doctor Who specials, The End Of Time. At first glance, it's the marvellous Bernard Cribbins alongside David Tennant in a quiet street (albeit looking a little startled).

But look a bit closer. That book that the Doctor is holding is called Fighting The Future, by Joshua Naismith. Joshua Naismith is a character in The End Of Time, being played by David Harewood (he's in the trailer for the episode).

How about a bit more, though? Remember the bus in Planet Of The Dead earlier in this year? It had an advert on the side of it. Remember who that advert was for? It was for a telecommunications company Neon by Naismith. The plot thickens.

We'll leave you to connect some of those dots together....!