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In a glimpse into the behind-the-scenes situation at M&S, Greencore chief executive Dalton Philips said: "In the absence of having all the systems speaking to each other, you revert to how it was 25 years ago."

However, Thea Green, chief executive of beauty brand Nails Inc, told the BBC her company had a major launch coming up and she was nervous about it, given the problems at M&S.

It is not known whether similar scenes are playing out behind the scenes at M&S, as the company has only issued limited information in its official statements, and has not put anyone up for interview.

The Metropolitan Police confirmed it is looking into the cyber attack at M&S.

On a warm afternoon back in October, Simpson offered a tour of her work on display at M Street Coffee in Sherman Oaks.