Battling retail giant, Marks & Spencer, has hired three top design firms to help shape the interior of its stores of the future. The three firms, 20/20, Rodney Fitch Design Consultants and Din Associates, are working with M&S on a future development plan. An M&S spokesman said: "It is very early stages and nothing has been determined but we are looking at what our stores could look like in 10 or 15 years' time.