‘I’m sorry, the yoga classes have been cancelled – we’re overstretched.’

Look, if you will, at Kate Middleton on the Isle of Mull for her wedding anniversary. There she was in skinny jeans, tucked-in blue shirt and tweed blazer, shod in what looked like sensible walking boots. It’s a look I like to call Royal Prep School Mummy, and she’s been at it for years: on