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WOLVERHAMPTON, ENGLAND - MAY 06: British Prime Minister Theresa May tours the UTC Aerospace Systems factory during a campaign visit on May 6, 2017 in Wolverhampton, England. Campaigning is underway ahead of the June 8th general election. Former John Lewis boss Andy Street was yesterday elected West Midlands metro mayor for the Conservatives as the party gained over 500 seats in local elections. (Photo by Jack Taylor/Getty Images)

WOLVERHAMPTON, ENGLAND - MAY 06: British Prime Minister Theresa May tours the UTC Aerospace Systems factory during a campaign visit on May 6, 2017 in Wolverhampton, England. Campaigning is underway ahead of the June 8th general election. Former John Lewis boss Andy Street was yesterday elected West Midlands metro mayor for the Conservatives as the party gained over 500 seats in local elections. (Photo by Jack Taylor/Getty Images)

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WOLVERHAMPTON, ENGLAND - MAY 06: (L-R) General Manager at UTC Aerospace Systems Robert Hupfer, British Prime Minister Theresa May and West Midlands Mayor Andy Street tour the UTC Aerospace Systems factory during a campaign visit on May 6, 2017 in Wolverhampton, England. Campaigning is underway ahead of the June 8th general election. Former John Lewis boss Andy Street was yesterday elected West Midlands metro mayor for the Conservatives as the party gained over 500 seats in local elections. (Photo by Jack Taylor/Getty Images)

WOLVERHAMPTON, ENGLAND - MAY 06: (L-R) General Manager at UTC Aerospace Systems Robert Hupfer, British Prime Minister Theresa May and West Midlands Mayor Andy Street tour the UTC Aerospace Systems factory during a campaign visit on May 6, 2017 in Wolverhampton, England. Campaigning is underway ahead of the June 8th general election. Former John Lewis boss Andy Street was yesterday elected West Midlands metro mayor for the Conservatives as the party gained over 500 seats in local elections. (Photo by Jack Taylor/Getty Images)

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WOLVERHAMPTON, ENGLAND - MAY 06: British Prime Minister Theresa May is greeted by West Midlands Mayor Andy Street outside UTC Aerospace Systems during a campaign visit on May 6, 2017 in Wolverhampton, England. Campaigning is underway ahead of the June 8th general election. Former John Lewis boss Andy Street was yesterday elected West Midlands metro mayor for the Conservatives as the party gained over 500 seats in local elections. (Photo by Jack Taylor/Getty Images)

WOLVERHAMPTON, ENGLAND - MAY 06: British Prime Minister Theresa May is greeted by West Midlands Mayor Andy Street outside UTC Aerospace Systems during a campaign visit on May 6, 2017 in Wolverhampton, England. Campaigning is underway ahead of the June 8th general election. Former John Lewis boss Andy Street was yesterday elected West Midlands metro mayor for the Conservatives as the party gained over 500 seats in local elections. (Photo by Jack Taylor/Getty Images)

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WOLVERHAMPTON, ENGLAND - MAY 06: British Prime Minister Theresa May is shown a display as she tours the UTC Aerospace Systems factory during a campaign visit on May 6, 2017 in Wolverhampton, England. Campaigning is underway ahead of the June 8th general election. Former John Lewis boss Andy Street was yesterday elected West Midlands metro mayor for the Conservatives as the party gained over 500 seats in local elections. (Photo by Jack Taylor/Getty Images)

WOLVERHAMPTON, ENGLAND - MAY 06: British Prime Minister Theresa May is shown a display as she tours the UTC Aerospace Systems factory during a campaign visit on May 6, 2017 in Wolverhampton, England. Campaigning is underway ahead of the June 8th general election. Former John Lewis boss Andy Street was yesterday elected West Midlands metro mayor for the Conservatives as the party gained over 500 seats in local elections. (Photo by Jack Taylor/Getty Images)