‘Oysters got trapped in fancy restaurants, which is why a lot of people went off them,’ laughs Rob Hampton, a man on a mission to change that. We meet at Covent Garden’s bijou seafood parlour, The Oystermen, which Hampton founded with Matt Lovell. Together, they transformed a greasy spoon with a false ceiling into a shipshape seafood bar awash with fresh crustacea and intriguing elixirs.