Ed Miliband said that the "national minimum wage must be set at a level where it doesn't cost jobs".
It follows yesterday's announcement that Labour would raise the fine for companies paying below the minimum wage to £50,000.
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A man, woman and a baby were rescued after the building set alight.
The duke was presented with the trunks by Australian presenter and Paralympian Dylan Allcott.
The Duchess of Sussex did not attend an Invictus event on Sunday.