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.

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.

The motto of West African cooking is that if the food doesn't set fire to the tablecloth the cook is being stingy with the pepper.

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?

If you just warn people, they often simply ignore you. But if you ask them a question, then they have to think about it. And once they start to think about the consequences, they almost always calm down. Unless they're drunk, of course. Or stoned. Or aged between fourteen and twenty-one. Or Glaswegian.

The media are doing this, not because they have a sinister motive, but because they love to feel that they are influencing events. That's why they hate politicians so much, because politicians have direct power and they do not.

The Metropolitan Police Service is still, despite what people think, a working-class organisation and as such rejects totally the notion of an officer class. That is why every newly minted constable, regardless of their educational background, has to spend a two-year probationary period as an ordinary plod on the streets. This is because nothing builds character like being abused, spat at and vomited by members of the public.