"The title for this episode provided an idea almost immediately. The Tardis trapped in the hourglass is a little nod to the Radio Times Doctor Who Christmas cover from 2005. The typography owes a debt to 1960s cocktail-era design, drawing on Christmas cards from the time. I wanted it to look a bit like an old Christmas card – pleasant at first glance, but more sinister when you look more closely..."The larger version of the poster can be seen below. "Last Christmas" will be broadcast Christmas Day at 6.15pm on BBC One and 9/8 CST on BBC America.
[Source: Radio Times]