Speaking during a Q&A session in Brighton, Labour leader Ed Miliband has vowed to "make work pay for the workers of Britain" and tackle a crisis in the cost of living.
He condemned David Cameron's government for allowing prices to rise faster than wages in 38 of its 39 months in office.
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Buckingham Palace, London's Tower Bridge, Old Trafford and Big Ben are taking part in the event to raise awareness about climate change.