Boxer Chris Eubank led thousands of peace campaigners from Sussex in Britain's biggest protest march - parking his trademark truck in Trafalgar Square.
Chris covered the vehicle with banners denouncing Tony Blair's hard-line stance on war with Iraq.
More than a million people from across the country marched through central London, a human tide determined to demonstrate their anger.
Chris's truck was draped in a banner reading: "Integrity is the only course, not war. Reason should be the only weapon".
He said the British and American governments should listen to the people.
He said: "It sends a message that this is a democracy and we have elected you to represent our views. The view of the people on the march, and people around the world, is we don't want to wage war on Iraq."
Lewes MP Norman Baker marched with fellow Liberal Democrats, including leader Charles Kennedy, who spoke at the Hyde Park rally.
Mr Baker said: "I think it was an extremely powerful coming together of huge numbers of people to give the message to the Prime Minister that the public at large do not have confidence in the policy he is pursuing.
"I think it says something positive about the human race when you think there were 600 marches around the world. It is a message to our leaders that people want peace not war."
Brighton and Hove city councillor Linda Austin helped carry a Brighton Labour Party banner through London streets.
She said: "The atmosphere was wonderful. I think the broad cross section of the country was very encouraging.
"I think the message it sends is that people are very concerned about what is happening, that they would rather see a peaceful solution to the Iraq issue and they really want to see the UN being used to reach a diplomatic solution.
"I would say the solution propagated by France and Germany is the one most people would subscribe to."
Cath Senker, of Sussex Action for Peace, said: "It was absolutely amazing. I think what hit most people was the diversity of people on the march.
"I think the message to Tony Blair has got to be either don't go to war with Iraq - or resign."
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