"Change begins now," British Labour leader Keir Starmer said early on Friday in a speech after his party won the national election, ending 14 years of Conservative government.

The Labour Party swept to power after winning the country's general election, crossing the 326-seat threshold for a working majority in the House of Commons. 

"A mandate like this comes with a great responsibility," Starmer told supporters at a triumphant dawn rally in London.

"Today we start the next chapter – begin the work of change, the mission of national renewal and start to rebuild our country," he continued.

He added the task of a Labour government is "nothing less than renewing the ideas hat hold our country together."

(With input from agencies)