UK Prime Minister Boris Johnson is among politicians to have congratulated Joe Biden on his US election win.
He said he looked forward to "working closely" with the new president-elect.
Labour leader Sir Keir Starmer praised Mr Biden's campaign of "decency, integrity, compassion and strength".
Former Home Secretary Sajid Javid said Biden's win was "good news" for the UK in terms of closer co-operation on climate change, free trade and fighting the Covid pandemic.
He told Sky News' Ridge on Sunday that Mr Johnson's closeness to Donald Trump had been "overstated" and the Conservative government actually had more in common, in terms of policy, with his Democratic rival.
"The US is our most important ally and I look forward to working closely together on our shared priorities"
— BBC Politics (@BBCPolitics) November 7, 2020
Boris Johnson congratulates Joe Biden on US election win https://t.co/MsxMjOQcH3
Vote counting continues after Tuesday's election, but the BBC projected on Saturday that Mr Biden has surpassed 270 electoral college votes - the threshold required to win.
Donald Trump's campaign has indicated the incumbent president does not plan to concede.
Mr Johnson said in a statement on Twitter on Saturday: "The US is our important ally and I look forward to working closely together on our shared priorities, from climate change to trade and security."
Mr Johnson, who has yet to meet Mr Biden, also congratulated the president-elect's running mate, Kamala Harris, on "her historic achievement". She will be the country's first female vice-president.
Foreign Secretary Dominic Raab said Mr Trump had "fought hard" but that he was looking forward to working with the new administration.
"The UK-US friendship has always been a force for good in the world," he added.
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