The UK will cut ties with the European Union at 11pm – almost a year after officially leaving the 27-nation bloc.
The trade deal agreed between Boris Johnson and EU chiefs avoids the need for import taxes – tariffs – which many businesses had feared.
But there will still be major changes to rules on travel, immigration, commerce, living and working abroad – as well as crime fighting and security.
Haulage firms remain concerned about hold-ups at ports.
Fears of giant tailbacks of lorries at Dover – in the event of a no-deal exit from the EU single market and customs union – have receded, but uncertainty remains about new customs rules.
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Among the things that will change from 23:00 GMT: