Mary Portas
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Mary Portas says her success was 'case of survival'

Mary Portas has worked her way up from window dresser at Harrods to advising David Cameron on how to save the high street.

She fell into the trade by mistake - as she reveals in her new book, Shop Girl.

Portas attributes her success to a "case of survival".

Go to next video: Portas call for high street help