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Open Image ModalA crowd of demonstrators gather outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalA demonstrator holds up a placard saying 'Stand together Stop Brexit' at an anti-Brexit protest in Trafalgar Square in central London on June 28, 2016.EU leaders attempted to rescue the European project and Prime Minister David Cameron sought to calm fears over Britain's vote to leave the bloc as ratings agencies downgraded the country. Britain has been pitched into uncertainty by the June 23 referendum result, with Cameron announcing his resignation, the economy facing a string of shocks and Scotland making a fresh threat to break away. / AFP / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images) (credit:JUSTIN TALLIS via Getty Images)
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Open Image ModalLONDON, ENGLAND - JUNE 28: Protesters gather against the EU referendum result in Trafalgar Square on June 28, 2016 in London, England. Up to 50,000 people were expected before the event was cancelled due to safety concerns. Early evening up to 300 people have still convereged on the square to vent their anti-Brexit feelings. (Photo by Jeff J Mitchell/Getty Images) (credit:Jeff J Mitchell via Getty Images)
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Open Image ModalA supporter holds a sign during a pro-EU rally in Trafalgar Square in London, after some of the pro-EU events organised in the aftermath of last week's historic referendum have been cancelled at short notice over safety concerns. (credit:Nick Ansell/PA Wire)
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Open Image ModalLONDON, ENGLAND - JUNE 28: Protesters gather against the EU referendum result in Trafalgar Square on June 28, 2016 in London, England. Up to 50,000 people were expected before the event was cancelled due to safety concerns. Early evening up to 300 people have still convereged on the square to vent their anti-Brexit feelings. (Photo by Jeff J Mitchell/Getty Images) (credit:Jeff J Mitchell via Getty Images)
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Open Image ModalLONDON, ENGLAND - JUNE 28: Protesters gather to demostrate against the EU referendum result in Trafalgar Square on June 28, 2016 in London, England. Up to 50,000 people were expected before the event was cancelled due to safety concerns. Early evening up to 300 people have still converged on the square to vent their anti-Brexit feelings. (Photo by Jeff J Mitchell/Getty Images) (credit:Jeff J Mitchell via Getty Images)
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Open Image ModalSupporters hold a sign above umbrellas during a pro-EU rally in Trafalgar Square in London, after some of the pro-EU events organised in the aftermath of last week's historic referendum have been cancelled at short notice over safety concerns. (credit:Nick Ansell/PA Wire)
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Open Image ModalSupporters during a pro-EU rally in Trafalgar Square in London, after some of the pro-EU events organised in the aftermath of last week's historic referendum have been cancelled at short notice over safety concerns. (credit:Ian West/PA Wire)
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Open Image ModalA supporter during a pro-EU rally in Trafalgar Square in London, after some of the pro-EU events organised in the aftermath of last week's historic referendum have been cancelled at short notice over safety concerns. (credit:Ian West/PA Wire)
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Open Image ModalDemonstrators gesture outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalDemonstrators gesture outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalCrowds demonstrate outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalCrowds of demonstrators gather outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalA couple kiss outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalDemonstrators gesture outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalDemonstrators gesture outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Paul Hackett (credit:Paul Hackett / Reuters)
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Open Image ModalDemonstrators stand outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalPeople demonstrate outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalA crowd of demonstrators gather outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalA demonstrator stands outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalDemonstrators gather outside the Houses of Parliament during a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)
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Open Image ModalDemonstrators walk along Whitehall as they take part in a protest aimed at showing London's solidarity with the European Union following the recent EU referendum, in central London, Britain June 28, 2016. REUTERS/Dylan Martinez (credit:Dylan Martinez / Reuters)