This video shows why campaigning against the war in Afghanistan must continue until the last British soldier has come home.

Like most people, Jeremy Clarke remembers where he was when the planes struck the Twin Towers in New York. But he could never have imagined the impact the consequences would have on his own life.

"I watched it at work on the internet," the retired computer engineer recalls. "But I had no idea how what we were seeing would shape world politics for the next decade."

As the dust settled on the tragedies in New York, at the Pentagon in Washington and at the Pennsylvania location of the Flight 93 crash, Jeremy's attention turned quickly to the political implications of the attacks.

"It's easy to forget just how rapidly America mobilised itself to invade Afghanistan. Within about three weeks American bombs were falling on the Afghans and American and British soldiers were not far behind them. I believed that however horrendous the 9/11 attacks were, destroying an entire country was not a proportionate or relevant response.

"I always felt, even then at the beginning of all this, that it was less about finding Bin Laden, and more about using 9/11 as an excuse to dominate regions they needed influence over to retain control of the oil industry. I never felt that was right, and I felt passionately enough to want to do something about it.

"I'd taken part in marches against the first Gulf War in 1991, but I'd never really been a political person – I've certainly never been a member of a political party. But this was different. It seemed so clearly wrong to me, that I wanted to do something about it."

Before the Americans had even started bombing Afghanistan in early October 2001, the Stop The War Coalition had been created. "It was clear that war was brewing, and many people around the country wanted to lobby against it," the 60-year-old recalls.

"The Bristol branch has always been strong – even now, 10 years on, we still have 3,000 people on our mailing list."

But Jeremy was not just signing up to be a member of the group – he was taking on the mantle of group co-ordinator for the city.

"It was a lot to take on, especially as I was still working in those days," he recalls. "But I felt it was so important that people who were against the military action were able to get their voice heard. The only way we could do that, was by coming together.

"I'm certainly not a pacifist," Jeremy adds. "I just think this has always been an unjust war – just as the invasion of Iraq was unjustified, and just as I disagree with the RAF bombing Libya in recent weeks – we wouldn't get involved with other peoples' civil wars if oil supplies were not being put under threat. It's all about oil. Always has been. That's what angers me."

Jeremy has been behind the organisation of numerous anti-war marches, meetings and vigils over the past 10 years. But some moments stand out.

"The main one for me was the national anti-war march in London in 2003, when two million people took part in the demonstration, and we had 63 coaches going from Bristol filled with anti-war demonstrators. That was quite a day.

"The other occasion that stays with me is the night the invasion of Iraq began, and we held a demonstration here on the streets of Bristol – with 4,000 to 5,000 people taking part. We blocked the end of the M32 for a number of hours, and caused a lot of fuss. Which, of course, was the idea."

But Jeremy believes that far from dissipating, anti-war feeling is still gathering pace. According to the latest statistics, more than 70 per cent of the population of the country believe we should withdraw our soldiers from Afghanistan," he says.

"We're all sick of seeing our boys come back in flag-draped coffins, just as much as we're sick of hearing about countless civilian deaths out there.

"It's all such a terrible waste of life. But as an organisation we will keep fighting against the war until the last of our soldiers comes home."