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.

The first rule about a black woman’s hair is you don’t talk about a black woman’s hair. And the second rule is you don’t ever touch a black woman’s hair without getting written permission first.

My dad was a fairy," said Zach. "And by that I don't mean he dressed well and enjoyed musical theatre.

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 general public have a warped view of the speed at which an investigation proceeds. They like to imagine tense conversations going on behind the venetian blinds and unshaven, but ruggedly handsome, detectives working themselves with single-minded devotion into the bottle and marital breakdown. The truth is that at the end of the day, unless you've generated some sort of lead, you go home and get on with the important things in life - like drinking and sleeping, and if you're lucky, a relationship with the gender and sexual orientation of your choice.

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.

For a terrifying moment I thought he was going to hug me, but fortunately we both remembered we were English just in time. Still, it was a close call.