The Duke of Cambridge has defended himself over criticism he is workshy – and revealed the moment the Queen gave him an "absolute bollocking".
The second-in-line to the throne said he was making the most of time to do another "worthwhile job" while he could and his family was supportive.
"I take duty very seriously. I take my responsibilities very seriously. But it's about finding your own way at the right time and if you're not careful duty can weigh you down at a very early age," he told the BBC.
"I think you have got to develop into the duty role."
In a separate interview he also said his grandmother had been "incredibly supportive" of him and someone for him to look up to.
Referring to a childhood incident, William also described getting into trouble with his cousin Peter Phillips after riding a quad bike at Balmoral.
He said: "We were chasing Zara around who was on a go-cart, and Peter and I managed to herd Zara into a lamppost. And the lamppost came down and nearly squashed her, and I remember my grandmother being the first person out at Balmoral running across the lawn in her kilt. (She) came charging over and gave us the most almighty bollocking, and that sort of stuck in my mind from that moment on."
He also credited the Queen for helping him through the loss of his mother, Diana, Princess of Wales, saying she had been a powerful female influence in his life.
The documentary will be shown on Sky News at 9pm on Wednesday.
Speaking to Sky News for a documentary called The Queen At 90, to celebrate the monarch's birthday, William recalled how a childhood telling off from The Queen stayed with him throughout his life.
He said: "She's been a very strong female influence and having lost my mother at a young age, it's been particularly important to me that I've had somebody like the Queen to look up to and who's been there and who has understood some of the more, um, complex issues when you lose a loved one...
"So she's been incredibly supportive and I've really appreciated her guidance."
PA
