So the Duchess of Cornwall's wink has gone viral. In a spontaneous gesture of levity, as Prince Charles ushered President Trump and his wife from the room after they had had tea at Clarence House, Camilla turned to her protection officer, her face creasing into an enigmatic smile – and she winked. Now it is all over the internet.

What was she trying to communicate? It hardly seems to matter. In one flicker of an eyelid, the Duchess of Cornwall managed to diffuse any tension over President Trump's visit. And it seemed to encapsulate everything the nation has come to