PRINCES REVEAL HEARTACHE... We still feel guilty for cutting short last phone call to our mum

to share the happiness and warmth that we had with her and what she was like as a person.”

One of the documentary’s most moving scenes is when the princes relive their final conversation with their mum, who was in Paris while they were on the royal Scottish estate at Balmoral.

Prince William tells the camera: “At the time Harry and I were running about minding our own business, you know, playing with our cousins and having a... a very good time.

“I think Harry and I were just in a desperate rush to... to say goodbye.

“You know, ‘See you later’ and we’re going to go off. And, if I’d known now obviously what was going to happen I wouldn’t have been so blasé about it and everything else. But, erm, that phone calls sticks in my mind quite, quite heavily.”

After William’s five-minute chat with his mum it was Harry’s turn.

The prince, 32, says on-screen: “I can’t really remember what I said, but all I do remember is... is probably, you know, regretting for the rest of my life how short the phone call was.

Hard

“And if I’d known that was the last time I was going to speak to my mother the things that I would – the things I would have said to her.

“Looking back on it now it’s incredibly hard.

“I have... I have to sort of deal with that for the rest of my life.” Harry also tells how he tried to hide his grief. He says: “The first time I cried was, was, er, at the funeral on the island.

“And probably like – and only since then maybe, maybe once.

“So there’s... you know, there’s a lot – there’s a lot of grief still needs to be – erm, to be let out.

“The ten years that I was in the Army I just sort of dug my head in the sand and was just – it was just white noise.”

He says he remembers looking at the sea of floral tributes left by members of the public for Diana at Kensington Palace and thinking: “How is it that so many