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NEWCASTLE, UNITED KINGDON - MAY 12: Prime Minister, Theresa May, speaks to party supporters in front of the Conservative party's general election campaign 'battle bus' at an airfield north of Newcastle, on May 12, 2017 in north-east England. Britain will vote in a general election on June 8. (Photo by Justin Tallis - WPA Pool/Getty Images)

NEWCASTLE, UNITED KINGDON - MAY 12:  Prime Minister, Theresa May, speaks to party supporters in front of the Conservative party's general election campaign 'battle bus' at an airfield north of Newcastle, on May 12, 2017 in north-east England. Britain will vote in a general election on June 8. (Photo by Justin Tallis - WPA Pool/Getty Images)

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NEWCASTLE, UNITED KINGDON - MAY 12: Prime Minister, Theresa May, speaks to party supporters in front of the Conservative party's general election campaign 'battle bus' at an airfield north of Newcastle, on May 12, 2017 in north-east England. Britain will vote in a general election on June 8. (Photo by Justin Tallis - WPA Pool/Getty Images)

NEWCASTLE, UNITED KINGDON - MAY 12:  Prime Minister, Theresa May, speaks to party supporters in front of the Conservative party's general election campaign 'battle bus' at an airfield north of Newcastle, on May 12, 2017 in north-east England. Britain will vote in a general election on June 8. (Photo by Justin Tallis - WPA Pool/Getty Images)

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NEWCASTLE, UNITED KINGDON - MAY 12: British Prime Minister Theresa May walks past the Conservative party's general election campaign 'battle bus' to thanks supporters after making a speech at an airfield north of Newcastle, on May 12, 2017 in north-east England. Britain will vote in a general election on June 8. (Photo by Justin Tallis - WPA Pool/Getty Images)

NEWCASTLE, UNITED KINGDON - MAY 12:  British Prime Minister Theresa May walks past the Conservative party's general election campaign 'battle bus' to thanks supporters after making a speech at an airfield north of Newcastle, on May 12, 2017 in north-east England. Britain will vote in a general election on June 8. (Photo by Justin Tallis - WPA Pool/Getty Images)

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NEWCASTLE, UNITED KINGDON - MAY 12: British Prime Minister Theresa May boards the Conservative party's general election campaign 'battle bus' after making a speech at an airfield north of Newcastle, on May 12, 2017 in north-east England. Britain will vote in a general election on June 8. (Photo by Justin Tallis - WPA Pool/Getty Images)

NEWCASTLE, UNITED KINGDON - MAY 12:  British Prime Minister Theresa May boards the Conservative party's general election campaign 'battle bus' after making a speech at an airfield north of Newcastle, on May 12, 2017 in north-east England. Britain will vote in a general election on June 8. (Photo by Justin Tallis - WPA Pool/Getty Images)

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NEWCASTLE, UNITED KINGDON - MAY 12: The Conservative party's general election campaign 'battle bus' is pictured at an airfield north of Newcastle, ahead of a speech by the party's leader and Britain's Prime Minister, Theresa May, on May 12, 2017 in north-east England. Britain will vote in a general election on June 8. (Photo by Justin Tallis - WPA Pool/Getty Images)

NEWCASTLE, UNITED KINGDON - MAY 12:  The Conservative party's general election campaign 'battle bus' is pictured at an airfield north of Newcastle, ahead of a speech by the party's leader and Britain's Prime Minister, Theresa May, on May 12, 2017 in north-east England. Britain will vote in a general election on June 8. (Photo by Justin Tallis - WPA Pool/Getty Images)