I was pretty sure that a smart Londoner like Beverley would have the brains to bail out of her car before the mob torched it, but I knew her mum wouldn’t forgive me if I didn’t check. I ran out, yelling my head off in the hope that everyone else would mistake me for a rioter too.

The noise hit me as soon as I was out the door. It was like an angry pub crowd but on an enormous scale, all strange half-chants and animal hooting noises. It wasn’t like a normal riot. In one of those, most of the crowd does nothing except watch and occasionally cheer. Show them a broken shop window and they’ll cheerfully liberate the contents, but like most people they don’t actually want to get their hands dirty. This was a mob of ringleaders: everyone from the suspiciously well-dressed young man to the matron in an evening gown was mad as hell and ready to break something. I got as close to the burning Mini as I could, and was relieved to see no sign of anyone in any of the seats. Beverley had sensibly legged it and I should have followed suit, but I was distracted by the sight of the helicopter hovering directly overhead.

The helicopter meant that GT, the Met’s Central Command, had taken direct operational control of the disturbance. This meant that dozens of ACPO rank officers were having their dinner parties, nights in with a DVD and evenings out with the mistress interrupted by urgent phonecalls by non-ACPO rank officers who were desperate to make sure that they were in no way responsible for anything. I’ll bet that GT knew early on that the wheels were coming off the wagon, and that as soon as the riot was over a grand game of musical inquiries would start. Nobody wanted to be the one without a chair when the music stopped.

It was that thought which, ironically, distracted me enough for Deputy Assistant Commissioner Folsom to be able to sneak up behind me. I turned when he called my name and found him stalking towards me. His conservative suit jacket – pinstripe, I saw now that he was close up – had lost a sleeve and all its buttons. He was one of those people whose faces twitch when they’re angry; they think they’re all icy calm but something always gives them away. In Folsom’s case it was a nasty tic by his left eye.

‘Do you know what I hate the most,’ he shouted. I could see that he’d rather be adopting a sinisterly conversational tone, but unfortunately for him the riot was too loud.

‘What’s that, sir?’ I asked. I could feel the heat from the burning Mini on my back – Folsom had me trapped.

‘I hate police constables,’ he said. ‘Do you know why?’