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STOKE-ON-TRENT, ENGLAND - FEBRUARY 20: Pottery worker Lisa Cooke demonstrates sponge decoration to British Prime Minister Theresa May and Stoke Central by-election candidate Jack Brereton, as they escorted by Emma Bridgewater (R) during a tour of 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)