British Prime Minister Boris Johnson signed the UK–EU agreement on post-Brexit trade and cooperation on Dec. 30, after it got parliamentary approval.
"I want everybody to understand that the treaty that I've just signed is not the end, it is a new beginning, and I think the beginning of what will be a wonderful relationship between the UK and our friends and partners in the European Union,” he said after signing the document.
“It's an excellent deal for this country but also for our friends and partners,” he said.
Johnson hailed the deal as “one of the biggest free trade agreements in the world” that will “safeguard millions of jobs and livelihoods in our UK and across the continent.”
The central purpose of the bill, he said, is to enable the UK to “trade and cooperate with our European neighbours on the closest terms of friendship and goodwill, whilst retaining sovereign control of our laws and our national destiny.”
Later, while talking to the BBC, Johnson called the Brexit trade agreement "a cakeist treaty." Britain can now "have our cake and eat it," he said, because it can free trade with the EU without having to conform with EU laws.
But he admitted that diverging from EU laws may lead to tariffs being applied to UK exports.
"If we feel that one side or the other is undercutting the other through their approach, and you can prove that over six months, you can prove the detriment to an independent arbitrator, then the other side can apply tariffs," he said.
But he said he had "no problem with that," because it would be a "sovereign decision" of either side to do it.
Britain's main opposition Labour Party voted for the deal, but said it did so only to prevent a no-deal Brexit.