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The funeral cortege carrying the coffin of former British Prime Minister Margaret Thatcher passes along Ludgate Hill towards St Paul's Cathedral on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990. (Photo by David Crump - WPA Pool/Getty Images) ( 166798357 )

The funeral cortege carrying the coffin of former British Prime Minister Margaret Thatcher passes along Ludgate Hill towards St Paul's Cathedral on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990. (Photo by David Crump - WPA Pool/Getty Images) ( 166798300 )

Britain's Queen Elizabeth II leaves St Paul's Cathedral at the end of the ceremonial funeral of British former prime minister Margaret Thatcher in central London on April 17, 2013. The funeral of Margaret Thatcher took place on April 17, with Queen Elizabeth II leading mourners from around the world in bidding farewell to one of Britain's most influential and divisive prime ministers. LEON NEAL/AFP/Getty Images ( 518983412 )

The Royal Artillery pass through Trafalgar Square ahead of the funeral procession for former British Prime Minister Margaret Thatcher on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and the Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minster Baroness Thatcher with a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 199 (Photo by Jordan Mansfield/Getty Images) ( 166796351 )

Armed service personnel march past as they return from St Paul's Cathedral on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990. (Photo by Matt Cardy/Getty Images) ( 166796921 )

Carol Thatcher, Marco Grass, Sarah Thatcher, Mark Thatcher, Michael Thatcher and Amanda Thatcher look on from the steps of St Paul's Cathedral as the coffin is placed in the hearse after the Ceremonial funeral of former British Prime Minister Baroness Thatcher at St Paul's Cathedral on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990. (Photo by Jeff J Mitchell/Getty Images) ( 166801494 )

A member of public reacts as the coffin containing late former British prime minister Margaret Thatcher is taken from St Clement Danes church during her ceremonial funeral in central London on April 17, 2013. The funeral of Margaret Thatcher took place on April 17, with Queen Elizabeth II leading mourners from around the world in bidding farewell to one of Britain's most influential and divisive prime ministers. CARL COURT/AFP/Getty Images ( 518984447 )

Mark Thatcher and his wife Sarah leave after the ceremonial funeral service for former British Prime Minister Margaret Thatcher in London, Wednesday, April 17, 2013. Thatcher, who died, at the age of 87 on 8 April, has been accorded a ceremonial funeral with military honours, one step down from a state funeral, Thatcher was elected Prime Minister on May 4, 1979 and she resigned on Nov. 28, 1990, after eleven years in office. (AP Photo/Alastair Grant) ( Britain Thatcher Funeral )

Crowds gather to watch as a Gun Carriage of The King's Troop Royal Horse Artillery carries the coffin of Former British Prime Minister Baroness Thatcher as it leaves St Clement Danes Church and travels onto St Paul's Cathedral on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990. (Photo by Matt Cardy/Getty Images) ( 166796194 )

Actress Joan Collins leaves after attending the funeral service of former British Prime Minister Margaret Thatcher at St Paul's Cathedral, in London April 17, 2013. Thatcher, who was Conservative prime minister between 1979 and 1990, died on April 8 at the age of 87. (AP Photo/Olivia Harris, pool) ( Britain Thatcher Funeral )

Guardsmen stake part in the ceremonial funeral of British former prime minister Margaret Thatcher outside St Paul's Cathedral in central London on April 17, 2013. The funeral of Margaret Thatcher took place on April 17, with Queen Elizabeth II leading mourners from around the world in bidding farewell to one of Britain's most influential and divisive prime ministers. GLYN KIRK/AFP/Getty Images ( 518983525 )

Britain's Queen Elizabeth greet Mark (C) and Carol Thatcher, (L) the children of former British prime minister Margaret Thatcher as they leave after the funeral service of their mother at St Paul's Cathedral in London April 17, 2013 Thatcher, who was Conservative prime minister between 1979 and 1990, died on April 8 at the age of 87. REUTERS/Suzanne Plunkett ( BRITAIN-THATCHER/ )

Singer Katherine Jenkins attends the Ceremonial funeral of former British Prime Minister Baroness Thatcher on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990. (Photo by Dan Kitwood/Getty Images) ( 166795072 )

Samantha Cameron and Prime Minister David Cameron leave the Ceremonial funeral of former British Prime Minister Baroness Thatcher at St Paul's Cathedral on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990 (Photo by Chris Jackson/Getty Images) ( 166798880 )

Former Prime Minister Gordon Brown and Cherie Blair attend the Ceremonial funeral of former British Prime Minister Baroness Thatcher at St Paul's Cathedral on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990. (Photo by Christopher Furlong/Getty Images) ( 166795052 )

Britain's Chancellor of the Exchequer George Osborne (L) and his wife Frances (2L) arrives St Paul's Cathedral at the end of the ceremonial funeral of British former prime minister Margaret Thatcher in central London on April 17, 2013. The funeral of Margaret Thatcher took place on April 17, with Queen Elizabeth II leading mourners from around the world in bidding farewell to one of Britain's most influential and divisive prime ministers. GLYN KIRK/AFP/Getty Images ( 518984504 )

The coffin of former British Prime Minister Margaret Thatcher is carried aloft by members of the armed forces into St Paul's Cathedral, central London for her funeral Wednesday April 17, 2013. (AP Photo/Dave Thompson/PA) ( Britain Thatcher Funeral )

Carol Thatcher, the daughter of former British Prime Minister Margaret Thatcher, and her partner Marco Grass attend the funeral of Margaret Thatcher in St Paul's Cathedral in London April 17, 2013. Thatcher, who was Conservative prime minister between 1979 and 1990, died on April 8 at the age of 87. REUTERS/Ben Stansall/Pool ( BRITAIN-THATCHER/ )

Britain's Queen Elizabeth (front L) and Mark Thatcher (R), son of former British prime minister Margaret Thatcher, watch as her coffin arrives in St Paul's Cathedral for the funeral service, in London April 17, 2013. Thatcher, who was Conservative prime minister between 1979 and 1990, died on April 8 at the age of 87. REUTERS/Paul Edwards/Pool ( BRITAIN-THATCHER/ )

A spectator waits for the funeral procession of former British prime minister, Margaret Thatcher, near St Paul's Cathedral, in London April 17, 2013. Thatcher, who was Conservative prime minister between 1979 and 1990, died on April 8 at the age of 87. REUTERS/Luke MacGregor ( BRITAIN-THATCHER/ )

Guests take their seats during the Ceremonial funeral of former British Prime Minister Baroness Thatcher at St Paul's Cathedral on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990 (Photo by Dominic Lipinski - WPA Pool/Getty Images) ( 166801439 )

Mark Thatcher, left, attenda the ceremonial funeral of his mother and former British Prime Minister Margaret Thatcher at St Paul's Cathedral in London, Wednesday April 17, 2013. World leaders and dignitaries from 170 countries are due to attend the funeral of former British Prime Minister Margaret Thatcher on Wednesday, an elaborate affair with full military honors that will culminate in a service at St. Paul's Cathedral in London. (AP Photo/Christopher Furlong, Pool) ( Britain Thatcher Funeral )

Amanda Thatcher, granddaughter of former British prime minister Margaret Thatcher, gives a reading during her funeral service at St Paul's Cathedral in London April 17, 2013. Thatcher, who was Conservative prime minister between 1979 and 1990, died on April 8 at the age of 87. REUTERS/Christopher Furlong/Pool ( BRITAIN-THATCHER/ )

Amanda Thatcher, granddaughter of former British Prime Minister Margaret Thatcher, delivers a reading during the funeral service in St Paul's Cathedral on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990. (Photo by Kirsty Wigglesworth - WPA Pool/Getty Images) ( 166801851 )

British Prime Minister David Cameron gives a reading during the ceremonial funeral of British former prime minister Margaret Thatcher at St Paul's Cathedral in central London on April 17, 2013. The funeral of Margaret Thatcher took place on April 17, with Queen Elizabeth II leading mourners from around the world in bidding farewell to one of Britain's most influential and divisive prime ministers. Christopher Furlong/AFP/Getty Images ( 518984642 )

British Foreign Secretary William Hague, Leader of the Labour Party Ed Miliband, Deputy Prime Minister Nick Clegg, Sarah Brown, former prime minister Gordon Brown, Cherie Blair, former prime minister Tony Blair, Norma Major, former prime minister John Major, Samantha Cameron and Prime Minister David Cameron attend the ceremonial funeral of British former prime minister Margaret Thatcher at St Paul's Cathedral in central London on April 17, 2013. The funeral of Margaret Thatcher took place on April 17, with Queen Elizabeth II leading mourners from around the world in bidding farewell to one of Britain's most influential and divisive prime ministers. Christopher Furlong/AFP/Getty Images ( 518984707 )

A view shows flowers atop the Union-Flag-draped coffin of former prime minister Margaret Thatcher during her funeral at St Paul's Cathedral in London April 17, 2013. Thatcher, who was Conservative prime minister between 1979 and 1990, died on April 8 at the age of 87. REUTERS/Kirsty Wigglesworth/Pool ( BRITAIN-THATCHER/ )

Britain's Queen Elizabeth II leaves St Paul's Cathedral at the end of British former prime minister Margaret Thatcher's ceremonial funeral in central London on April 17, 2013. The funeral of Margaret Thatcher took place on April 17, with Queen Elizabeth II leading mourners from around the world in bidding farewell to one of Britain's most influential and divisive prime ministers. ANDREW COWIE/AFP/Getty Images ( 518984626 )

The Bearer Party made up of personnel from the three branches of the military carry the coffin of British former prime minister Margaret Thatcher out of St Paul's Cathedral at the end of her ceremonial funeral in central London on April 17, 2013. The funeral of Margaret Thatcher took place on April 17, with Queen Elizabeth II leading mourners from around the world in bidding farewell to one of Britain's most influential and divisive prime ministers. ANDREW COWIE/AFP/Getty Images ( 518984082 )

The family of British former prime minister Margaret Thatcher follows her coffin as the Bearer Party made up of personnel from the three branches of the military carry it out of St Paul's Cathedral at the end of her ceremonial funeral in central London on April 17, 2013. The funeral of Margaret Thatcher took place on April 17, with Queen Elizabeth II leading mourners from around the world in bidding farewell to one of Britain's most influential and divisive prime ministers. LEON NEAL/AFP/Getty Images ( 518983211 )

A policeman stands guard as The hearse makes it way past Downing Street during the Ceremonial funeral of former British Prime Minister Baroness Thatcher at Downing Street on April 17, 2013 in London, England. Dignitaries from around the world today join Queen Elizabeth II and Prince Philip, Duke of Edinburgh as the United Kingdom pays tribute to former Prime Minister Baroness Thatcher during a Ceremonial funeral with military honours at St Paul's Cathedral. Lady Thatcher, who died last week, was the first British female Prime Minister and served from 1979 to 1990. (Photo by Gareth Cattermole/Getty Images) ( 166795136 )