Prince Harry and Earl Spencer could hardly have been clearer. Princess Diana’s landmark appearance on Panorama in 1995 led to her death. Martin Bashir’s “interview of the century” – as it was boastfully billed by the BBC at the time – attracted an audience of 23 million viewers, and had profound and far-reaching consequences for the Royal family. And, according to her younger brother and her youngest son, it also proved to be Diana’s fatal mistake. Their clear inference was that, had she not been persuaded to invite Bashir into her sitting room at Kensington Palace, she would not have met her death two years later in a car accident in Paris.