There was everything from saris, kimonos and Ankara churchwear to Romanian football kit and, in great news for everyone, even a tiny Dutch milkmaid. My son’s “express your culture” day at school looked like an unrealistically utopian Argos advert. It helps that I’m a proud resident of Lewisham, south-east London, one of the biggest, brightest and most brilliant diversity jumble sales on the planet.