Pro-Brexit supporters celebrate Brexit at a gathering at Parliament Square, in London, Britain, on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Stephen Chung/Xinhua)

A pro-Brexit supporter celebrates Brexit at a gathering at Parliament Square, in London, Britain, on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Stephen Chung/Xinhua)

Pro-Brexit supporters celebrate Brexit at a gathering at Parliament Square, in London, Britain, on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Stephen Chung/Xinhua)

Pro-Brexit supporters celebrate Brexit at a gathering at Parliament Square, in London, Britain, on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Stephen Chung/Xinhua)

Pro-Brexit supporters celebrate Brexit at a gathering at Parliament Square, in London, Britain, on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Stephen Chung/Xinhua)

Photo taken on Jan. 31, 2020 shows an image of the text "UK Votes OUT" on a giant screen as pro-Brexit supporters celebrating Brexit at a gathering at Parliament Square, in London, Britain. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Stephen Chung/Xinhua)

A pro-Brexit supporter dressed as a town crier celebrates Brexit at a gathering at Parliament Square, in London, Britain, on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Stephen Chung/Xinhua)

Pro-Brexit supporters celebrate Brexit at a gathering at Parliament Square, in London, Britain, on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Stephen Chung/Xinhua)

The Big Ben Clock shows 11 p.m. (2300 GMT), in London, Britain on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Tim Ireland/Xinhua)

Photo taken on Jan. 31, 2020 shows a general view of the Houses of Parliament in London, Britain. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Tim Ireland/Xinhua)

Pro-Brexit demonstrators celebrate Brexit at the Parliament Square in London, Britain, on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Xinhua/Han Yan)

The Big Ben Clock shows 11 p.m. (2300 GMT), in London, Britain on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Tim Ireland/Xinhua)

The color of the British national flag is projected onto the wall of 10 Downing Street in London, Britain, on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Xinhua/Han Yan)

The Big Ben Clock shows 11 p.m. (2300 GMT), in London, Britain on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Tim Ireland/Xinhua)

The Big Ben Clock shows 11 p.m. (2300 GMT), in London, Britain on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Tim Ireland/Xinhua)

The Big Ben Clock shows 11 p.m. (2300 GMT), in London, Britain on Jan. 31, 2020. Britain officially left the European Union (EU) at 11 p.m. (2300 GMT) Friday, putting an end to its 47-year-long membership of the world's largest trading bloc. (Photo by Tim Ireland/Xinhua)