The Royal Mail worker who rang my bell to deliver an Amazon package on Friday was wearing a glittery ball gown because she and her colleagues were fundraising for local hospitals: ‘Two thousand quid so far,’ she said cheerily as she accepted my donation and thanks. But if I had asked her what she thought of the performance of her ultimate boss Rico Back — chief executive of Royal Mail until his sudden departure after less than two years in the job — I suspect she might not even have recognised his name, so remote has this German-born, Swiss-resident big...