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In the 20 years since the death of Diana, Princess of Wales, countless attempts have been made to explain why her life and death touched us so much, but the two people who knew her best, her sons William and Harry, have rarely spoken out.

Now, in this extraordinary documentary, they open their hearts, and their photo albums, to reveal just what made their mum so special and how they still feel her loss, particularly as her grandchildren grow up.

The princes also allow cameras to follow them as they carry out charity work for causes close to Diana’s heart.

A moving and eye-opening look behind the headlines at the complex and caring woman we all felt we knew.