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Mark Reckless has been sworn in as Ukip’s second elected MP after winning the Rochester and Strood by-election.
Mr Reckless finished 2,920 clear of the Conservatives, while Labour was further back in third position. The Liberal Democrats lost their deposit, taking just 1% of votes and finishing well behind the Green party.
In his victory speech, Mr Reckless told voters: “Come with us and we will give you back your country.”
He was sworn in to the House of Commons this morning in order to take part in a debate on the future of the NHS. As he arrived in the chamber, he was flanked by fellow Ukip MP Douglas Carswell and Conservative Philip Hollobone.
Ukip leader Nigel Farage hailed the win as "a victory for honesty" and said the "balls are up in the air" for the 2015 general election.
"I'm delighted... we managed to overcome them. It's a massive result," he told Good Morning Britain.
But David Cameron said the Tories were "absolutely determined" to recover the seat in May’s general election.
“Anything other than a Conservative government will put our recovery at risk and mean Ed Miliband in Downing Street,” the Prime Minister told reporters. “And I'm more determined than ever to make sure that we deliver security for Britain."
Ed Miliband meanwhile said the election had been a "two-horse race" between the Conservatives and Ukip, branding it a "devastating result" for the Prime Minister.
The Labour leader said: "This is one of his safest seats. He told us he was throwing everything at it. He assured us he was going to win. And in fact he lost, and he lost badly."
And he put the Ukip surge down to "deep discontent about the country", vowing to learn the "wider lessons" of the night's result.
See how all the action unfolded on our liveblog here.
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