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LONDON, ENGLAND - MAY 11: Prime Minister Theresa May chats with youth activists during a visit to the Young Minds mental health charity on May 11, 2017 in London, England. Campaigning continued by all parties today ahead of the June 8th general election. (Photo by Carl Court - WPA Pool /Getty Images)

LONDON, ENGLAND - MAY 11:  Prime Minister Theresa May chats with youth activists during a visit to the Young Minds mental health charity on May 11, 2017 in London, England. Campaigning continued by all parties today ahead of the June 8th general election.  (Photo by Carl Court - WPA Pool /Getty Images)

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LONDON, ENGLAND - MAY 11: Prime Minister Theresa May has a drink as she chats with youth activists during a visit to the Young Minds mental health charity on May 11, 2017 in London, England. Campaigning continued by all parties today ahead of the June 8th general election. (Photo by Carl Court - WPA Pool /Getty Images)

LONDON, ENGLAND - MAY 11:  Prime Minister Theresa May has a drink as she chats with youth activists during a visit to the Young Minds mental health charity on May 11, 2017 in London, England. Campaigning continued by all parties today ahead of the June 8th general election.  (Photo by Carl Court - WPA Pool /Getty Images)

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Britain's Prime Minister Theresa May (2L) chats with youth activists during a visit to the Young Minds mental health charity in London on May 11, 2017, ahead of the upcoming general election. / AFP PHOTO / POOL / Carl Court (Photo credit should read CARL COURT/AFP/Getty Images)

Britain's Prime Minister Theresa May (2L) chats with youth activists during a visit to the Young Minds mental health charity in London on May 11, 2017, ahead of the upcoming general election.   / AFP PHOTO / POOL / Carl Court        (Photo credit should read CARL COURT/AFP/Getty Images)