At the March 2011 demonstration, there were clashes between police and protesters in Trafalgar Square - hours after a peaceful march to Hyde Park.
"The man in the coffin may well have been living in a substantial Roman villa estate somewhere around Trafalgar Square - a big country house maybe with a little village, even, associated with it, " he said.
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The far more likely option is that a group like al-Qaeda will attempt, in my belief, a conventional type attack in a major population centre such as Leicester Square, Trafalgar Square - somewhere like this that has high impact or maybe Parliament Square using a conventional bomb device and therefore it could kill a large number of people and injure many more.
The cast will be performing in an arena as big as Trafalgar Square at heights of 145ft - the height of Nelson's Column.
The ceremony followed a 90-minute open-topped parade from Mansion House during which the two buses crawled through thousands of flag-waving fans as crowds built up in a sun-drenched Trafalgar Square.
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The Royal British Legion - which is celebrating its 90th anniversary this year - held a "Silence in the Square" event in Trafalgar Square, featuring musical performances and readings before the two-minute silence.
The memorial service took place at St Martin-in-the-Fields, near Trafalgar Square in central London.
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The 800-seat venue, close to Trafalgar Square, opened in 1882 as the Royal Avenue Theatre, becoming the Playhouse 25 years later.
Several hundred anti-war demonstrators have also marched to a rally in Trafalgar Square from the US Embassy in central London.
Essex-born Mark Wallinger is best known for his sculpture for the empty fourth plinth in Trafalgar Square.
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