The memorial service took place at St Martin-in-the-Fields, near Trafalgar Square in central London.
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Her sculpture Monument was commissioned for the Fourth Plinth in Trafalgar Square in 2001.
They include a vigil at Whitehall and a protest walk from Trafalgar Square to the Foreign Office.
Essex-born Mark Wallinger is best known for his sculpture for the empty fourth plinth in Trafalgar Square.
He drove down an empty Piccadilly, crossed Trafalgar Square in silence, and parked outside the unguarded Buckingham Palace.
Arriving once again to a very crowded Trafalgar Square we could see Nelson lit up by a searchlight.
He also cited public events like the open air opera held in Covent Garden piazza and Trafalgar Square.
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Having said all that, the reception from Londoners when it was finally unveiled in Trafalgar Square was largely positive.
After all, this is a man who gave away 500 designer polystyrene chairs in Trafalgar Square six years ago.
Inspiration for the plinth came from the Fourth Plinth in Trafalgar Square, London.
Every year, Trafalgar Square in London becomes home to an enormous Christmas tree.
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Demonstrators marched past parliament and 10 Downing Street before converging at Trafalgar Square.
Several hundred anti-war demonstrators have also marched to a rally in Trafalgar Square from the US Embassy in central London.
The Mall leads from the palace to Trafalgar Square , where the towering Nelson's Column is flanked by huge bronze lions.
The 800-seat venue, close to Trafalgar Square, opened in 1882 as the Royal Avenue Theatre, becoming the Playhouse 25 years later.
The street names of Spring Gardens (near Trafalgar Square) and Millbank (where the Abbey's mill once stood) echo Westminster's watery past.
Meanwhile police attended a demonstration in central London where hundreds of opponents of the former prime minister turned out at Trafalgar Square.
The parade is set to start at around 1345BST on Piccadilly and will end up on the north terrace of Trafalgar Square.
Tens of thousands of viewers might then troop off to Trafalgar Square to see these works in the flesh, so to speak.
Let the foxes exercise their right to take refuge in Trafalgar Square.
Finbarr Donely, from Dublin, who was snapping a photo of his daughter on Trafalgar Square, said London is much quieter than he anticipated.
"It's nice that he is there - he's my coach, " he said at England's O2 Scrum on the Beach event at Trafalgar Square.
The cast will be performing in an arena as big as Trafalgar Square at heights of 145ft - the height of Nelson's Column.
The pair became suspicious when they were photographed at the planned rendezvous with a reporter in Trafalgar Square, central London, and fled without payment.
"We've been to Covent Garden and not a lot is happening, so we may go to Trafalgar Square and then go home, " said James.
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The Games will also be screened along with live entertainment at Trafalgar Square and at Potters Field by City Hall, bringing further travel congestion.
Pro-Kremlin Russian Londoners have struck up a close friendship with the city's mayor, and sponsor a popular and entertaining winter festival in Trafalgar Square.
At the March 2011 demonstration, there were clashes between police and protesters in Trafalgar Square - hours after a peaceful march to Hyde Park.
Their route will take them from Whitehall past Trafalgar Square, through Admiralty Arch and straight on to the official London residence of the British sovereign.
" and "what is the name of the admiral who died in a sea battle in 1805 and has a monument in Trafalgar Square, London?
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