More than 70 business leaders have signed a letter to the Sunday Times calling for a public vote on the UK’s Brexit deal.

The chief executive of Waterstones and former Sainsbury’s boss Justin King are among those saying a “destructive hard Brexit” will damage the UK economy.

A group called Business for a People’s Vote will launch on Thursday.

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Luke Johnson,the chair of cake shop chain Patisserie Valerie, has waived his salary and pledged to give up some of his other jobs as he battles to turn around the cake shop after an accounting scandal.

The multimillionaire has told the board of the chain’s listed parent company that he will not collect his £60,000 annual salary for his remaining time at the group.