UK high street retailer Marks & Spencer has revealed plans to roll-out another 20 Simply Food convenience stores throughout the country, following a successful trial of the two outlets opened in July. Speaking earlier today [Tuesday] by conference call, CEO Luc Vandevelde said that M&S was still looking for appropriate locations to open the Simply Food stores. Once the 20 are open, the group aims to review its convenience operations and "decide how many more stores" will follow.