You’ve been eating afternoon tea all wrong! Etiquette guru reveals the do’s and don’ts, from the ‘royal’ sandwich shape to why the pinkie is NEVER lifted (and the food that, if missing, is ‘tantamount to treason’)

The afternoon tea was invented by one of Queen Victoria’s ladies-in-waiting, the seventh Duchess of Bedford, Anna Maria Russell, in 1840.Yet despite nearly 200 years of tradition, many in Britain still serve – and eat – afternoon tea all wrong.Luckily,...