Chancellor George Osborne has said the Newark by-election win was a "strong win for the Conservatives" and it was "disastrous" for the Labour Party.
Asked what he thought of the Ukip performance after the anti-EU party came second, he said:
"The Ukip vote was down on where it was a few weeks ago. We have an argument we can take to the country now about the change Britain needs."
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Another cold night across Britain with temperatures closely dipping below freezing in rural areas in the north.
Investigative journalist Sue Lloyd-Roberts, who worked at both ITN and BBC News, has died after a battle with leukaemia.