BOOTLE, ENGLAND - FEBRUARY 15: British Prime Minister Theresa May arrives for a visit to Captain Shaw's Primary School on February 15, 2017 in Bootle, north-west England. The Prime Minister is visiting Copeland to support Conservative By-election Candidate Trudy Harrison. (Photo by Scott Heppell - WPA Pool /Getty Images)

BOOTLE, ENGLAND - FEBRUARY 15:  British Prime Minister Theresa May arrives for a visit to Captain Shaw's Primary School on February 15, 2017 in Bootle, north-west England. The Prime Minister is visiting Copeland to support Conservative By-election Candidate Trudy Harrison. (Photo by Scott Heppell - WPA Pool /Getty Images)