When you're being earnest, people think you're being sarcastic and when you're being sarcastic, they think you're being earnest. The moral in all this, of course, is that people should never attempt to communicate.

Creationists reject Darwin's theory of evolution on the grounds that it is "just a theory". This is a valid criticism: evolution is indeed merely "a theory", albeit one with ten billion times more credence than the theory of creationism - although, to be fair, the theory of creationism is more than just a theory. It's also a fairy story. And children love fairy stories, which is presumably why so many creationists are keen to have their whimsical gibberish taught in schools.

When you're being earnest, people think you're being sarcastic and when you're being sarcastic, they think you're being earnest. The moral in all this, of course, is that people should never attempt to communicate.

"Be Right Back," in which Hayley Atwell brings Domhnall Gleeson back from the dead using his social-media profile, sprang out of an unrelated conversation. Other stories you thrash away at for weeks and weeks.

Online you're encouraged to perform one personality for everyone.

The logic for me, in writing it is that the different areas or different years are almost like different rooms.

I mean, sometimes we do do that, The National Anthem was a caustic satire and sometimes that's the way to go with the story rather than me being particularly misanthropic.