The letters from and to Princess Mary, the only daughter of George V, which form the basis of a Channel 4 series offer an unprecedented insight into one of the monarchy’s most turbulent periods that led to the abdication of Edward VIII in 1936.
This is an era and event subjected to such endless analysis over so many years that it might have been supposed that there was little new to be discovered.
Yet Princess Mary’s letters have demonstrated otherwise.
They have also shown something else – that the Royal Family, like all others in Britain, have always had their heartaches and secrets.
And by revealing them, the Harewood letters are a valuable addition to our country’s history.