Save Britain’s Heritage has criticised Marks and Spencer’s warning that it will leave its flagship Oxford Street store if its controversial plans to demolish and rebuild the site are blocked, saying it is not the “attitude of a retailer dedicated to sustainability”.

The campaign group’s lawyer said M&S had dismissed the option of refurbishing the 1930 Art Deco building to such an extent that they “have made a threat to the secretary of state to leave…altogether if they do not get their way.”

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