When Prince Harry shared his therapy session with Oprah Winfrey, on his docuseries The Me You Can’t See, most of us didn’t expect to see him with arms crossed across his chest, tapping alternate shoulders and solemnly stating “London is a trigger”. It turns out the Duke of Sussex was having eye movement desensitisation and reprocessing, or EMDR, whose other famous advocates include Sandra Bullock, David Beckham and Lady Gaga.