Prime Minister Boris Johnson says he has spoken to Joe Biden to congratulate the US President-elect, in their first call since his victory over Donald Trump was declared.
Downing Street said the pair discussed a number of issues during the conversation, including the defence partnership between their two nations.
"They discussed the close and longstanding relationship between our countries and committed to building on this partnership in the years ahead, in areas such as trade and security – including through NATO," said a spokesperson.
"The Prime Minister and President-elect also looked forward to working closely together on their shared priorities, from tackling climate change, to promoting democracy, and building back better from the coronavirus pandemic."
Mr Johnson later wrote on Twitter that he looks forward to "strengthening the partnership" between the United States and the United Kingdom.
Downing Street said Mr Johnson also "conveyed his congratulations" to Vice President-elect Kamala Harris and invited Mr Biden to the United Nations climate crisis summit in Glasgow next year.
The phone call comes amid UK efforts to negotiate a post-Brexit trade deal with Washington, following Mr Biden’s warning against a hard border on the island of Ireland.
US President Donald Trump has been criticised for straining relations within NATO, repeatedly calling on other member nations to spend more on defence in contribution to the military alliance.
Other defence issues are set to fall to Joe Biden, several impacting the UK.
They include the direction of the military campaign against the so-called Islamic State terror group.
There is also Afghanistan, where the US is withdrawing troops, saying it will get them all out by April if the Taliban commits to peace talks and severs ties with Al Qaeda.
Donald Trump suggested last month that remaining American service personnel in Afghanistan could leave the country by Christmas.
Cover image: PA.