(FILES) A pro-remain protester holds up an EU flag with one of the stars symbolically cut out in front of the Houses of Parliament shortly after British Prime Minister Theresa May announced to the House of Commons that Article 50 had been triggered in London on March 29, 2017. 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 OLI SCARFF / AFP via Getty Images)

(FILES) An aerial picture shows freight shipping containers stacked on the dock ahead of loading, at the container terminal of Southampton Docks in Southampton on the south coast of England on April 16, 2026. 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)

(FILES) People march with EU flags and pro-Europe slogans on placards during a March for Europe protest against the Brexit vote in London on September 3, 2016. 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 JUSTIN TALLIS / AFP via Getty Images)

(FILES) Demonstrators hold up Pro-Europe placards at an anti-Brexit protest in Trafalgar Square in central London on June 28, 2016. 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 JUSTIN TALLIS / AFP via Getty Images)

(FILES) A person uses the Automated European Union Entry/Exit System (EES) kiosk during a press preview on the rollout of the EU's new Entry-Exit System (EES) at Eurotunnel, south east England on September 23, 2025. 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 Justin TALLIS / AFP via Getty Images)

(FILES) A poster featuring a Brexit vote ballot with "out" tagged is on display at a book shop window in Berlin on June 24, 2016. 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 John MACDOUGALL / AFP via Getty Images)

(FILES) People look towards the One Inspiration cargo ship, registered under the flag of Liberia, as it is loaded at the container terminal of Southampton Docks in Southampton on the south coast of England on April 16, 2026. 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)

(FILES) The sun sets behind the Victoria Tower at the Palace of Westminster, home to the Houses of Parliament, in London on December 8, 2020, as talks on a trade deal between the EU and the UK enter a critical stage. 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 Tolga Akmen / AFP via Getty Images)