Letting one’s hair turn grey would be the most subversive Royal act

I think we can all agree that “disaster” is quite a hefty word. It is bigger than “accident”, and bigger even than “calamity”. In my battered 85-year-old thesaurus, it ranks up there with “catastrophe, tragedy, ruin”. Yet this is how celebrity hairdresser Nicky Clarke has chosen to describe what would happen if the Duchess of Cambridge – brace yourselves – allows herself to go grey.