Whistlestop is redesigning selected stores on a trial basis, with the first outlet to receive the treatment on the London Bridge station concourse.

Externally, red and green lettering on a black background has been replaced with white writing on a red background, with the sub-branding 'The Food Market'.

The internal layout has been changed to convey a more upmarket, health-conscious feel, with greater emphasis on fresh food. Sections include fresh sandwiches and salads, with fruit and flowers positioned close to the entrance. A new pick 'n' mix nut and dried fruit snack range is also being trialled. The wine section has been given a more premium feel by replacing metal shelving with wooden boxes for fine wine bottles.

"We want these stores to complement M&S Simply Food outlets, which we operate at stations and airports as well," said Michelle Murphy, head of retail for Whistlestop owner SSP.

"This is about offering balanced solutions, so if people want crisps and a Cornish pasty that's fine, but they can have fruit with it."

Other Whistlestop outlets, including London Victoria station, have been earmarked for the treatment.