I just got back from wandering round the sites. Looks like Lambeth Bridge is cleared, and the smallish grouping on Millbank was surrounded withhout much infrastructure so I imagine that will be gone by morning. Both sites at the top of Parliament Square looked fairly solid, as does Whitehall, St Jame's Park is full of tents and Trafalgar Square is still blocked with a sound system playing. It was all very nice if a bit middle class and sober and boring.
But I saw the opposite from police. Apart from on Millbank, it was like they didn't care. Gazebos and stuff were going up in Trafalgar Square and they were just standing and watching. There were only a handful of uniforms round St Jame's Park and the Mall and no real sign of any police activity, no sirens in the background, lines of vans etc. It was weird, like they'd surrendered. Maybe they were taking a break and are planning a blood bath in the early hours, but none of the sites looked that much of a challenge for them to move, the big structures and vehicles were all loosely surrounded although there were still some lock ons, the roads were all closed and the coppers who were there were standing around eating McDs and chatting amongst themselves. There certainly didn't seem like there was the will, numbers or intent to shut the thing down, although I guess things could look very different come the morning.