The retail guru works with four businesses to help improve the quality of their customer service. At a family-run convenience store in Burnham, Buckinghamshire, she's shocked to see how staff behave when they don't know they're being filmed. Too much clowning around means out-of-date food is being left on the shelves, so Mary takes supervisor Dean and his team to a Michelin-starred restaurant to show them how to work well together. She also wants owner Keshu to rethink the products he stocks and give his savvy daughter Ash more responsibility.

The retail guru heads to the Suffolk seaside town of Lowestoft to take on her biggest challenge yet. She's working with Godfreys, a family-run department store that customers are deserting, resulting in a dire financial situation. Owner Jim has shared management duties between his stepchildren Laura and David, but with a massive overdraft, the store's future is in doubt. Determined to turn the staff into product-knowledge experts, Mary organises a trip to Spitalfields Market and devises a customer-service test in an attempt to give the team the confidence they need.

Mary Portas heads to south-east London, and London Fashion Week, to help Gemma get her struggling clothes boutique Diosa back on track selling urban fashion to young women

Mary takes on a struggling car dealership in Aylesbury, urging the blokes who run it to undergo a culture change to appeal equally to women and men