But of course no one foresaw how the internet would change the way people shop and, in doing so, fundamentally alter the economics of these sheds. If 15% of Britain’s groceries are now bought online it follows that our existing supermarkets now have 15% too much space. This is why they are either having to close stores or find alternative uses for the space. Rather late in the day, investing institutions have become a lot less keen on retail space — be it in the form of supermarkets, poorly sited retail parks, or shops on once-vibrant High Streets.