Ed Miliband has paid tribute to Labour MEP candidate Del Singh, who died in a suicide bombing at a restaurant in Kabul.
The Labour leader said he was "appalled and shocked by this barbarous act of terror".
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The Royal Fleet Auxiliary ship RFA Argus has been recognised for providing aviation and medical support over 33 years of service.
Buckingham Palace, London's Tower Bridge, Old Trafford and Big Ben are taking part in the event to raise awareness about climate change.
Widespread frost for most areas as temperatures dip below freezing.