The UK and EU will begin a new relationship when their trade deal kicks in later (2300GMT).
The legislation behind the deal has been passed by the UK's Parliament.
The agreement has also been signed by London and Brussels, so it can begin as the Brexit transition period ends in hours from now.
It sees the UK leaving the European single market and customs union, but avoids tariffs on goods.
Alex Altmann is a Brexit expert at accounting and tax advisors Blick Rothenberg - he hopes the deal can be built on in the years ahead.
IN: "The trade...
OUT: ...economy."
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