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BRISTOL, ENGLAND - FEBRUARY 23: Alan Johnson, who is leading Labour's pro-EU campaign speaks with employees after giving a speech at Airbus on February 23, 2016 in Bristol, England. The former Home Secretary and head of Labour In for Britain, warns that 50,000 manufacturing jobs could be put at risk if the UK votes to leave the European Union in the referendum on June 23. (Photo by Matt Cardy/Getty Images)

BRISTOL, ENGLAND - FEBRUARY 23:  Alan Johnson, who is leading Labour's pro-EU campaign speaks with employees after giving a speech at Airbus on February 23, 2016 in Bristol, England. The former Home Secretary and head of Labour In for Britain, warns that 50,000 manufacturing jobs could be put at risk if the UK votes to leave the European Union in the referendum on June 23.  (Photo by Matt Cardy/Getty Images)