A person holds an anti-Brexit placard outside the Houses of Parliament in London, Britain, on Jan. 17, 2019. Leading economists have warned that the British economy could suffer if the country leaves the European Union (EU) without a deal, following the overwhelming defeat of the Withdrawal Agreement in the British Parliament. (Photos: Xinhua)

A UK flag and an EU flag are seen outside the Houses of Parliament in London, Britain, on Jan. 17, 2019. Leading economists have warned that the British economy could suffer if the country leaves the European Union (EU) without a deal, following the overwhelming defeat of the Withdrawal Agreement in the British Parliament.

The statue of former British Prime Minister Winston Churchill is seen outside the Houses of Parliament in London, Britain, on Jan. 17, 2019. Leading economists have warned that the British economy could suffer if the country leaves the European Union (EU) without a deal, following the overwhelming defeat of the Withdrawal Agreement in the British Parliament.

The Houses of Parliament are silhouetted against sunshine in London, Britain, on Jan. 17, 2019. Leading economists have warned that the British economy could suffer if the country leaves the European Union (EU) without a deal, following the overwhelming defeat of the Withdrawal Agreement in the British Parliament.

An EU flag is seen in front of a UK flag outside the Houses of Parliament in London, Britain, on Jan. 17, 2019. Leading economists have warned that the British economy could suffer if the country leaves the European Union (EU) without a deal, following the overwhelming defeat of the Withdrawal Agreement in the British Parliament.

An EU flag is seen in front of a UK flag outside the Houses of Parliament in London, Britain, on Jan. 17, 2019. Leading economists have warned that the British economy could suffer if the country leaves the European Union (EU) without a deal, following the overwhelming defeat of the Withdrawal Agreement in the British Parliament.