The march arrives at Parliament Square, 3pm

Street theatre is monitored for impartiality

War is peace, slavery is freedom

Marchers still streaming past, 4pm

Meanwhile on Westminster Bridge, a breakaway group

"Let me help you up"

...not a happy one

The police have everything under control

But what's that in the distance?

Hundreds more arrive and retake the bridge

Followed by the not-so-Forward Intelligence Team

Tensions rise as police try to keep marchers to the offical route

press freedom placard

As darkness falls, the crowd hold the bridge, 5pm

In spite of the cold they stay put, 6pm

All the police can do is stand and watch

Eventually reinforcements arrive

The road is gradually cleared of protesters, 7pm