Stephen Poliakoff's drama tells the little-known story of Prince John, youngest child of George V and Queen Mary, who was hidden away from public life due to his epilepsy and learning difficulties.
Prince John's short life spanned one of the most momentous periods in history - the political build-up to World War I and the machinations of European royalty in the early part of the 20th Century.
The cast includes Miranda Richardson, Michael Gambon and Gina McKee.
BBC Prince John - The Windsors Tragic Secret (Documentary)
Film Duration: 48 min