FILE - In this file photo dated Saturday, Dec. 14, 2019, a British flag waves atop of Houses of Parliament as an aircraft approaches the airport in London. After nearly five decades of economic and social integration, from the start of 2021 Britain will embark on a more-distant relationship with the European Union, and freedom of movement seems set to dramatically change for people wanting to cross the English Channel. (AP Photo/Thanassis Stavrakis, FILE)
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