Demonstrators revealed yesterday that they had used Google Earth to plot their protest on the roof of the Houses of Parliament last week against the expansion of Heathrow.

The website, which allows users to zoom in on satellite photographs of Earth, “showed us all the walkways, steps and other details we needed to make our way across the roof from the door to the far side where the public could see us”, said Leo Murray, one of the five protesters.

The planning for the stunt began last autumn after the government published documents for a public consultation on a possible third runway at Heathrow.“What really enraged us was the government saying it supported the idea [of a third runway] even before the consultation began,” said Murray, 31, a postgraduate student in animation. “The consultation was also rigged to exclude almost any mention of climate change.”

Tamsin Omond, a 23-year-old with a first-class degree in English literature from Cambridge, described how they were able to map out the interior of the Palace of Westminster without raising suspicions. “We sent in a reconnaissance group who simply wandered around till they found the route to the roof ending in an open door. The fag butts around it showed it was being used by smokers,” she said.They managed to recruit a young Commons insider who, thanks to having a security pass, was able to carry the banners, handcuffs (bought from a Soho sex shop) and other equipment past the body scanners and X-ray machines that are supposed to protect the buildings.

In all about 15 activists were involved. Though some now face court action, they are determined to continue their campaign.

There are suggestions they may try to disrupt the opening of Heathrow’s terminal five later this month and that a large protest is being planned for Hyde Park this summer. “What the Commons saw this week is just the start,” said Omond.

Protest directory: where to join up

Hacan Clear Skies A voluntary organisation that campaigns against airport expansion and for the rights of those living under flight paths. 020 8876 0455, www.hacan.org.uk

The 2M Group An alliance of 12 local authorities around Heathrow representing 2m people concerned about the environmental impact of the airport’s expansion on their communities. Membership comprises eight London boroughs as well as those of Slough,Windsor and Maidenhead and the South Bucks District Council. www.2mgroup.org.uk

No Trag The No Third Runway Action Group is a residents’ association against the runway plans and the resulting destruction of Sipson village. www.notrag.org

Plane Stupid A nonviolent direct action group that campaigns against airport expansion and greenhouse gas emissions from the aviation industry. 07948 219 493, 07828 632 136, www.planestupid.com

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