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The Prince, who died in April this year, was remembered for his good sense of humour and his forthright manner by other family members in Prince Philip: The Royal Family Remembers.
Watch a trailer below.
And Prince Harry revealed the advice the Duke of Edinburgh, himself a former commander in the Royal Navy, gave him when he first toured Afghanistan as part of his role in the British Army in 2008.
“When I was going off to Afghanistan, he was very matter of fact,” Harry explained. “He said to me: ‘Make sure you come back alive.’
“And then, when I came back, here wasn’t a deep level of discussion, there was more a: ‘Well you made it, how was it?’
“That’s how he was. He was a listener. He set the scene for you to share as much as you wanted to share, but he would never probe.”
The Duke of Sussex, who recently stepped back from royal duties to move to America with wife Meghan Markle, has always had a close relationship with his grandfather.
Elsewhere in the documentary, he talks about his love for Prince Philip’s long-lasting marriage to Queen Elizabeth II, and how heart-warming it was to see them together.
“The two of them together were the most adorable couple,” Prince Harry explains. “I don’t think anyone has described them as adorable but from knowing his cheekiness…and seeing behind what the world sees, you have these two young individuals that are very much in love, and at a very young age decided to dedicate their life to service.
“The places where these two travelled, and the things that they saw and the experienced they went through – that is an incredible bond between two people.
“I miss [him] more for my grandmother, because I know how incredibly strong she was with him there.”
Prince Philip: The Royal Family Remembers airs Wednesday at 9pm on BBC One.
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