ATHLETICS-GBR-MARATHON(01 of51)
Open Image ModalBritish Olympic double gold medallist Mo Farah (C) runs in the 2013 London Marathon in Blackheath in southeast London on April 21, 2013. AFP PHOTO / CARL COURT RESTRICTED TO EDITORIAL USE / NO COMMERCIAL USE (Photo credit should read CARL COURT/AFP/Getty Images) (credit:Getty Images)
Virgin London Marathon 2013(02 of51)
Open Image ModalLONDON, ENGLAND - APRIL 21: Runners stand in a silent tribute to the victims of the Boston Marathon bombings before the start of the London Marathon from Greenwich Park on April 21, 2013 in London, England. Thousands of runners are taking part - with some wearing black ribbons as a mark of respect to the Boston victims. Extra police are on duty as an estimated 500,000 people line the streets of the capital. (Photo by Peter Macdiarmid/Getty Images) (credit:Getty Images)
Athletics - 2013 Virgin London Marathon - London(03 of51)
Open Image ModalPreperations are made to the finish area before the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(04 of51)
Open Image ModalMedals on display before the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(05 of51)
Open Image ModalGreat Britain's Mo Farah (left) at the start of the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(06 of51)
Open Image ModalGreat Britain's Mo Farah (left) at the start of the Virgin London Marathon in London. (credit:PA)
Katherine Jenkins(07 of51)
Open Image ModalKatherine Jenkins runs this year's Virgin London Marathon, at the Green Start Line, in Greenwich Park, east London, Sunday, April 21, 2013. Katherine's father passed away with lung cancer and she is running for cancer charity Macmillan. (Photo by Joel Ryan/Invision/AP) (credit:AP)
Katherine Jenkins(08 of51)
Open Image ModalKatherine Jenkins, centre, at the Green Start Line of this year's Virgin London Marathon, , in Greenwich Park, east London, Sunday, April 21, 2013. Katherine's father passed away with lung cancer and she is running for cancer charity Macmillan. (Photo by Joel Ryan/Invision/AP) (credit:AP)
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Open Image ModalBritish police officers maintain their usual guard at the gates of Downing Street near the route of the London Marathon in London, Sunday, April 21, 2013. The London Marathon started in defiant mood on a glorious sunny morning Sunday despite concerns raised by the bomb attacks on the Boston Marathon six days ago. London's is the first major international marathon since the double bomb attack near the finish line in Boston, which left three people dead and more than 170 injured, including many who are still hospitalized. (AP Photo/Matt Dunham) (credit:AP)
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Open Image ModalBritish police officers have something to eat near the route of the London Marathon in London, Sunday, April 21, 2013. The London Marathon started in defiant mood on a glorious sunny morning Sunday despite concerns raised by the bomb attacks on the Boston Marathon six days ago. London's is the first major international marathon since the double bomb attack near the finish line in Boston, which left three people dead and more than 170 injured, including many who are still hospitalized. (AP Photo/Matt Dunham) (credit:AP)
Athletics - 2013 Virgin London Marathon - London(11 of51)
Open Image ModalSpectators watch as runners cross Tower Bridge during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(12 of51)
Open Image ModalRunners help themselves to water during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(13 of51)
Open Image ModalHarry Judd poses during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(14 of51)
Open Image ModalKatherine Jenkins poses during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(15 of51)
Open Image ModalKatherine Jenkins poses during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(16 of51)
Open Image ModalWayne Hemingway poses during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(17 of51)
Open Image ModalHarry Judd poses during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(18 of51)
Open Image ModalHarry Judd poses during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(19 of51)
Open Image ModalSian Williams (centre) poses with colleagues Sophie Raworth (right) and Susanna Reid during the Virgin London Marathon in London. (credit:PA)
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Open Image ModalA runner wears a black ribbon in memory of the victims of Boston Marathon bombings starts the race during the London Marathon, London, Sunday, April 21, 2013. (AP Photo/Sang Tan) (credit:AP)
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Open Image ModalRunners wear black ribbons in memory of the victims of Boston Marathon bombings start the race during the London Marathon, London, Sunday, April 21, 2013. (AP Photo/Sang Tan) (credit:AP)
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Open Image ModalA runner wears a black ribbon in memory of the victims of Boston Marathon bombings starts the race during the London Marathon, London, Sunday, April 21, 2013. (AP Photo/Sang Tan) (credit:AP)
Athletics - 2013 Virgin London Marathon - London(23 of51)
Open Image ModalEthiopia's Tsegaye Kebede competes during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(24 of51)
Open Image ModalEthiopia's Tsegaye Kebede competes during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(25 of51)
Open Image ModalGreat Britain's Richard Whitehead (left) competes during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(26 of51)
Open Image ModalKenya's Emmanuel Mutai competes during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(27 of51)
Open Image ModalEthiopia's Ayele Abshero competes during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(28 of51)
Open Image ModalGreat Britain's Amy Whitehead competes during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(29 of51)
Open Image ModalDa Costa of Brazil waves at the crowds during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(30 of51)
Open Image ModalGreat Britain's paralympic gold medalist Richard Whitehead during the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(31 of51)
Open Image ModalGreat Britain's Mo Farah in the elite mens race during the Virgin London Marathon in London. (credit:PA)
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Open Image ModalBritish police officers gather at the start at Blackheath during the London Marathon in London, Sunday, April 21, 2013. The London Marathon started as planned on a glorious sunny morning Sunday despite concerns raised by the bomb attacks on the Boston Marathon six days ago. (AP Photo/Sang Tan) (credit:AP)
Athletics - 2013 Virgin London Marathon - London(33 of51)
Open Image ModalGreat Britain's Mo Farah (second left) at the start of the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(34 of51)
Open Image ModalGreat Britain's Mo Farah (left) at the start of the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(35 of51)
Open Image ModalGreat Britain's Mo Farah (left) at the start of the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(36 of51)
Open Image ModalGreat Britain's Mo Farah (centre) before the start of the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(37 of51)
Open Image ModalA runner wearing a USA vest competes during the 2013 Virgin London Marathon, London. (credit:PA)
Mo Farah(38 of51)
Open Image ModalBritain's Mo Farah gestures as he prepares to start the elite men race during the London Marathon, London, Sunday, April 21, 2013. (AP Photo/Sang Tan) (credit:AP)
Competitors observe thirty seconds silence before competing in the 2013 Virgin London Marathon, London....(39 of51)
Open Image ModalCompetitors observe thirty seconds silence before competing in the 2013 Virgin London Marathon, London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(40 of51)
Open Image ModalGreat Britain's Mo Farah reacts before competing in the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(41 of51)
Open Image ModalGreat Britain's Mo Farah (centre) before the start of the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(42 of51)
Open Image ModalGreat Britain's Mo Farah (centre) at the start of the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(43 of51)
Open Image ModalGreat Britain's Mo Farah (left) at the start of the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(44 of51)
Open Image ModalGreat Britain's Mo Farah (centre) at the start of the Virgin London Marathon in London. (credit:PA)
Athletics - 2013 Virgin London Marathon - London(45 of51)
Open Image ModalGreat Britain's Mo Farah (centre) at the start of the Virgin London Marathon in London. (credit:PA)
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Open Image ModalRunners observe a 30 second silent in memory of Boston Marathon bombings before the start during the London Marathon, London, Sunday, April 21, 2013. (AP Photo/Sang Tan) (credit:AP)
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Open Image ModalRunners observe a 30 second silent in memory of Boston Marathon bombings before the start during the London Marathon, London, Sunday, April 21, 2013. (AP Photo/Sang Tan) (credit:AP)
Mo Farah(48 of51)
Open Image ModalBritain's Mo Farah, center, starts the elite men race during the London Marathon, London, Sunday, April 21, 2013. (AP Photo/Sang Tan) (credit:AP)
Yoko Shibui(49 of51)
Open Image ModalYoko Shibui of Japan, center, prepares to compete in the elite women's race during the London Marathon in London, Sunday, April 21, 2013. (AP Photo/Sang Tan) (credit:AP)
Yukiko Akaba(50 of51)
Open Image ModalYukiko Akaba of Japan starts the elite women race during the London Marathon, London, Sunday, April 21, 2013. (AP Photo/Sang Tan) (credit:AP)
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Open Image ModalCompetitors take off at the start of the 5 kilometer long race, a side-show to the 26th international Belgrade Marathon race, in Belgrade, Serbia, Sunday, April 21, 2013.(AP Photo/Darko Vojinovic) (credit:AP)