Down in the shambolic climate camp, protesters plot a campaign of panic

The two policemen at the entrance to the eco-camp waved me through after perfunctory questioning. "I'm a student and I just wanted to join the protest," I explained as the officers allowed me into the camp - no more than a bare bit of scrubland at Heathrow's northern perimeter and about a mile from the terminals.

Now to get past the camp organisers' scrutiny. There was no welcoming committee and no questions asked by the eco-activists, now numbering about 150, who were milling about the field, plotting the week ahead.

PCC ruling on Heathrow protest by the Camp for Climate Action

I pitched my tent in the "eastside", the area set aside for activists from the east Midlands, Nottingham and Cambridge, though London activists were supposed to pitch in the camp's main belt, next to the perimeter.

Around the camp was a heavy police cordon. The advance party of activists, mostly in their twenties or thirties - a typical bunch of students, mature students and perennially unemployed - were joined by several veterans in their fifties and sixties. They were well organised and well supplied. New arrivals were asked to donate £30 a day towards the £40,000 cost of running the week-long camp. The money would also pay for communally cooked food. I stumped up the money, hoping I would blend in and not wishing to stand out.

By 9.30pm the first of several tedious site meetings had been called. It was conducted by an American man alongside an English man and woman. None would give their real names, referring to themselves only as "elders" and saying there would be no hierarchy. All decisions would be made by total consensus and not majority votes. It was shambolic. One meeting - on how to dig a hole for a latrine - took 45 minutes to complete.

Priorities were to establish base camps for each "neighbourhood" unit so that contingents from London, the South Coast, Manchester, Yorkshire and others would all be self-sufficient.

One "elder" said each neighbourhood would elect a representative who could be vouched for by a known activist so they could be trusted with confidences.

After the first meeting, groups sat late in to the night drinking and smoking and talking of their plans.

Two protesters said they had taken part in clashes with police at the recent G8 Summit in Germany.

Another woman in her thirties said: "Climate camp will be bigger than G8 and we have to make people sit up and take notice around the world." One of the G8 veterans said: "Security is the key," urging us to "get them panicked with different things at the same time like bags left around the airport and people climbing the fence". Late that night I saw two protesters carry out reconnaissance on the security fences. There were no police to see them.

I was told by one woman that though climate change was the focus, the week would also see the arrival of experienced anti-capitalists, rioters from mainland Europe. Who would they be targeting? "The usual - Starbucks, McDonalds, all the corporates are at Heathrow."

Next morning police moved in to conduct searches. Only after I identified myself as a journalist did officers let me get back to my tent.

Most of yesterday was spent hammering in tent pegs for 300 or so activists who had by now turned up. Police patrols appeared hourly.

By now more and more journalists were arriving. Organisers spotted my camera equipment and asked why I had pitched in the wrong area. London activists declared they had never seen me before and my identity as a reporter was rumbled. Last night I left, heading for a hot shower and a decent meal, leaving about 350 protesters to bring chaos to Heathrow.