As one of Cai's companions (I'm the shouty, bespectacled blonde in the photos above), I just wanted to say that this is totally represenative of my experiences of Saturday's demo. I tried to run from the kettling on Whitehall (mostly because everyone else was running and it was scary), and was grabbed round the waist by a policeman in riot padding (no helmet) and pushed back into the kettle. I asked, politely, why I couldn't pass and the man utterly refused to engage with me in any way: no answer, no eye-contact. It was unpleasant and intimidating.