With the recent interest in Danish drama on the BBC, people have come to the conclusion that there are only 12 actors in Danish television. The removal man father of the murder victim in The Killing turned up as the Minister of Defence in Borgen, for instance.

And, to further confuse matters, the actress who plays the TV journalist in Borgen is the spitting image of Billie Piper, so much so that when I caught a few minutes of a Dr Who re-run a few weeks ago, I was wondering what Katrine was doing in the Tardis.