Royals and celebrities warned to watch words as lip-reading videos go viral

Advisers say to ‘assume the cameras are always rolling’ as exchanges can be decoded in seconds and posted online

Royals and celebrities are being warned by their representatives and advisers to watch what they say when they are out of the house – or palace – as a lip-reading phenomenon means videos can be posted online and translated in seconds.

Prince William was recently embroiled after a video of him speaking to Andrew Mountbatten-Windsor was translated by an expert lip-reader who was working as part of a forthcoming Channel 5 documentary, Lip-Reading the Royals.