Mark Ritson: This is not just a decline, this is an M&S decline

It’s July, which means that another quarter of retail data is in and, as regular as a battered old clock that you should have thrown out years ago but couldn’t quite bring yourself to dispose of, Marks & Spencer (M&S) is once again announcing another set of “disappointing” numbers.
Despite its central location on almost every British high street, M&S is a very strange beast in that it runs two entirely different businesses from within its four walls. There is