Not being invited in is one of the boxes on the “suspicious behavior” bingo form that every copper carries around in their head along with “stupidly overpowerful dog” and being too quick to supply an alibi. Fill all the boxes and you too could win an all-­expenses-paid visit to your local police station.

Carved above the lintel were the words SCIENTIA POTESTAS EST. Science points east, I wondered? Science is portentous, yes? Science protests too much. Scientific potatoes rule. Had I stumbled on the lair of dangerous plant geneticists?

This is your brain on magic.

Questions would be asked. Answers would be ignored.

Actually I'd always thought he sat in the library with a slim volume of metaphysical poetry until the commissioner called him on the bat phone and summoned him into action. Holy paranormal activity, Nightingale - to the Jag mobile.

My Dad says that being a Londoner has nothing to do with where you're born. He says that there are people who get off a jumbo jet at Heathrow, go through immigration waving any kind of passport, hop on the tube and by the time the train's pulled into Piccadilly Circus they've become a Londoner.

This I know for a fact: the reason African women have children is so that there's someone else to do the housework.