Boris Johnson said a deal reached with the European Union will help protect jobs and provide certainty to businesses.
The Prime Minister said the agreement resolves the European question which has "bedevilled" British politics for generations.
In a Downing Street press conference Mr Johnson said the UK had managed to "take back control" as promised in the 2016 Brexit referendum.
The Prime Minister told a No 10 press conference: "We have taken back control of our laws and our destiny. We have taken back control of every jot and tittle of our regulation in a way that is complete and unfettered.
"From January 1 we are outside the customs union and outside the single market.
"British laws will be made solely by the British Parliament interpreted by British judges sitting in UK courts and the jurisdiction of the European Court of Justice will come to an end."
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