STOKE-ON-TRENT, ENGLAND - FEBRUARY 20: British Prime Minister Theresa May is escorted by Emma Bridgewater and Stoke Central by-election candidate Jack Brereton, as she arrives at the Emma Bridgewater pottery factory in Hanley on February 20, 2017 in Stoke-On-Trent, England. The prime ministers visit comes ahead of crucial by-elections in Stoke-On-Trent and Copeland this week. (Photo by Christopher Furlong -Pool/Getty Images)