Climate Camp protesters will 'lay siege' to BAA's headquarters tomorrow in a direct action campaign.

The group says it has decided 'collectively' on the action, which will start by marking out the land which would be destroyed if a third runway was built at Heathrow.

Protesters will walk the course the proposed runway would follow, marking out on the ground they have vowed to defend.

They will then lay an overnight siege to BAA's corporate headquarters.

Andy Taylor of the Climate Camp said: "We are marking the land which we will defend from the proposed third runway.

"The fight belongs not just to those whose homes will be destroyed, but all those who want to defend this planet, our home, from the resulting climate change.

"Everybody should be here. BAA and the Government do not have the right to decide whether this runway goes ahead. The decision should be made by the millions who would be impacted by it not to the few that would profit from it."