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In so many ways the epitome of 21st century protest -- rendezvous for roadblocks organised by web and mobile.



There was the light-hearted approach to making your point, along with the angry and direct method.



And there were the familiar police tactics of shoving roadblockers off the streets and belting anybody who resisted.



Subduing them, and arresting them - and yet all around something quite new was going on. Our first sight of it was from a distance -- stop...search...and what's this? Letting them go with some kind of paperwork?



The kind of paperwork, in fact, that is issued to those stopped, searched or arrested under the new Prevention of Terrorism Act.



It allows police to stop you without reasonable suspicion -- unlike existing laws -- and they were using it indiscriminately on protesters today in London where ever they met them.



By lunchtime things were getting surreal - one of London's most senior police saying this law is never used in Britain for public order control - let alone London.



We saw and filmed protesters repeatedly stooped and searched walking along the road and issued with notices under the Terror Act.



No wonder the Home Office told us they want an urgent report from the police about what they did today under anti-terror laws.



As it became law in Parliament, the public was given assurances that this law would not be used to suppress political dissent or for public order -- today that is precisely what we witnessed on the streets of the capital.