The Big Ben's clock shows 11 o'clock in London, Jan 31, 2020. The UK officially left the EU at 11 pm local time (2300 GMT). (ALASTAIR GRANT / AP)

Brexit supporters wave Union flags as the time reaches 11 o'clock, at Parliament Square, venue for the Leave Means Leave Brexit Celebration, in central London on Jan 31, 2020, the day that the UK formally leaves the European Union. (DANIEL LEAL-OLIVAS / AFP)

The colors of the British Union flag illuminate the exterior of 10 Downing street, the residence of the British Prime Minister, in London, England, Jan 31, 2020. (KIRSTY WIGGLESWORTH / AP)

Brexit supporters celebrate at George Square in Glasgow, England, as Britain officially leaves the European Union on Jan 31, 2020. (ANDREW MILLIGAN / PA VIA AP)

Brexit supporters celebrate at George Square in Glasgow, England, as Britain officially leaves the European Union on Jan 31, 2020. (ANDREW MILLIGAN / PA VIA AP)

Brexit supporters celebrate at George Square in Glasgow, England, as Britain officially leaves the European Union on Jan. 31, 2020. (ANDREW MILLIGAN / PA VIA AP)

This handout picture released by Sky News on Jan 31, 2020 shows a farewell message projected onto the White Cliffs of Dover, on the southern coast of England, the day the UK formally leaves the European Union. (TIM P. WHITBY / SKY NEWS / AFP)