Flamboyant boxing legend Chris Eubank has thrown another punch in his campaign to embarrass the Government over Britain's involvement in Iraq.

The 40-year-old ex-world middleweight champion was still ducking and weaving as he drove his 32ft truck around Parliament Square in London yesterday.

And he proved he still had his ringsmarts when he beat the police's guard and swung the seven-tonne Peterbilt vehicle past an armed patrol to enter Whitehall and approach Downing Street.

The stunt ended with Mr Eubank's second arrest for breaching the peace so far this year.

After police dropped charges against him from an earlier protest, he drove to London to deliberately get himself arrested again.

His truck cab bore the message: "Mr Brown, you know that the policy in Iraq cannot succeed.

Democracy cannot be exported with a gun. You can be the great leader and the great peace maker."

A Metropolitan Police spokeswoman, who described his £54,000 truck as a "tractor unit", confirmed a man in his 40s was arrested for breach of the peace after repeatedly trying to park in a restricted area.

Mr Eubank, of The Upper Drive, Hove, had been expecting to answer bail at Charing Cross Police Station yesterday after he was arrested in February when he used the truck to campaign to stop Prince Harry going to Iraq.

That day he was displaying a sign saying: "Blair, don't send our young prince to your catastrophic illegal war to make it look plausible."

When he answered bail in March he took the £54,000 vehicle with him carrying the legend: "Mr Blair, look after our people and our country. Military occupation causes terrorism.

"As long as we elect you, do the things we want - security, healthcare, education, social security."

Mr Eubank had been arrested for allegedly breaching the peace, driving without due care and attention and for staging an unauthorised protest, but the Crown Prosecution Service dropped the charges.

However he decided to go to London anyway to keep his campaign in the public eye.

He told The Argus: "I have got to get back out there and be prosecuted because if I am prosecuted I can keep it in the news."

The Serious Organised Crime and Police Act 2005 restricts the right of the public to demonstrate within an exclusion zone of up to one kilometre from any point in Parliament Square.

The affected area includes the Houses of Parliament themselves, Whitehall and Downing Street.

Under the Act one person acting alone may count as a demonstration.

In March, Mr Eubank's solicitor Mark Stephens denied the truck protest was a publicity stunt.

He said his client was a man of "high moral passion".

Mr Stephens added: "He is not a man who courts media for no particular reason."