City of London Police closed off the western side of the bridge, creating a protest pen some hundred yards from the arriving guests. To drive home the point they occasionally filled the gap with a couple of alsatians.

FIT filming on the eastern side was more subtle than usual, but police had unearthed an ancient bye-law preventing anyone from standing still.

As a bye-law this is of course not an arrestable offense.

Except that City cops decided that refusing to comply - such as stopping to give out leaflets - is an arrestable offense, after which they made arrests under Section 25 of PACE.

Protesters made up a wide spectrum, from Critical Mass (who made two passes), Rising Tide, HACAN and NOTRAG (No Third Runway Group). Being by no means full time activists, the Heathrow based groups expressed surprise and disgust at the level and manner of policing. Several passed me their names to forward in case they were arrested.

Air transport is the fastest growing contributor to climate change. Fuelled by the cheap flight revolution, flights have doubled in the UK in the past 20 years, and are set to double again in 15. The UK plans to build 4 new Heathrow sized airports by 2020.

And as Blair bangs on about fighting climate change, aviation fuel remains untaxed, so each individual taxpayer subsidises the aviation industry to the average tune of £500 per year.