Passport control at Gatwick Airport

LONDON, ENGLAND - MAY 28: Border Force check the passports of passengers arriving at Gatwick Airport on May 28, 2014 in London, England. Border Force is the law enforcement command within the Home Office responsible for the security of the UK border by enforcing immigration and customs controls on people and goods entering the UK. Border Force officers work at 140 sea and airports across the UK and overseas. (Photo by Oli Scarff/Getty Images)