(FILES) A British police officer stands guard on the beach of Dungeness, on the southeast coast of England, on June 15, 2022, as Royal National Lifeboat Institution's (RNLI) members of staff help migrants to disembark from one of their lifeboat after they were picked up at sea while attempting to cross the English Channel. June 23, 2026 marks 10 years since the UK voted for Brexit, upending the country's politics and triggering fraught negotiations that finally concluded when it left the European Union in January 2020. Immigration, trade and the economy were all key issues during the Brexit campaign. (Photo by Ben Stansall / AFP via Getty Images)