If we're going to deal with the real causes of terrorism, it's got to be through making the world more inclusive and fairer to all

Activist Barry Coates

Protest organisers say current rules favour the commercial interests of the most powerful trading nations and corporations, at the expense of the wider public interest.

They want new rules which would be aimed at sustainable development, the eradication of poverty and the promotion of human rights.

11 September effect

Before the 11 September attacks, protests against the WTO were sometimes violent and very high-profile.

At the third ministerial WTO conference, in Seattle in 1999, street protesters battled with police for three days and the event made headlines throughout the world.

But activists have found it increasingly difficult to make their voices heard in the aftermath of the attacks.

Barry Coates, director of the World Development Movement, told the BBC the movement is now trying to argue that global trade and terrorism are inextricably linked.

"If we're going to deal with the real causes of terrorism, it's got to be through making the world more inclusive and fairer to all," he said.

"We've got to come together in one world, and remember that most of the world is living on around $2 a day, and this is actually a counter-terrorism movement."

Carnival feel

Speakers at Saturday's protest including Naomi Klein, author of best-selling anti-globalisation book, No Logo.

She has said that the protest movement was "in a difficult position" after the terrorist attacks.

But she said the Doha might be "a blessing in disguise" if it led people to focus on the local level and "make connections in our own backyard".

The Trade Justice Movement is a new grouping of organisations calling for fundamental change to the rules governing international trade.

Members include Christian Aid, Friends of the Earth, Oxfam, Save the Children, Tearfund, Traidcraft, and various others.

The parade will leave the Imperial War Museum at about 1330 GMT and arrive for the speakers at Trafalgar Square at about 1500 GMT.

Event organisers hope for a carnival feel to the parade, with floats, giant puppets, samba bands and drummers.

Organisers said the movement had taken "comprehensive steps" to ensure that the parade is a peaceful event.