Official figures published in the last half an hour show unemployment fell by 45,000 between January and March to 2.63 million.
The number of people claiming jobseeker's allowance last month fell by 13,700 to 1.59 million, according to the Office for National Statistics.
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The world record attempt will raise money for the foundation set up in memory of the Olympic gold medallist, who died in May 2013.
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