Last updated at 06:20
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In pictures: Prince William in BBC's Helicopter Rescue

A new BBC documentary series captures the Duke of Cambridge at work as an RAF rescue helicopter pilot.
For the first time a television series has captured the Duke of Cambridge at work as an RAF search and rescue helicopter pilot.
Prince William at work as an RAF helicopter pilot
He's based at RAF Valley on Anglesey in North Wales. Last year, the two RAF search and rescue bases covering Wales were called out 566 times, making them the busiest in Britain, with more than 470 people being rescued.
Search and rescue helicopter in flight over the sea, piloted by Prince William
In one of the rescues featured on the first programme, Prince William is the aircraft captain as the crew is called to an old slate quarry in Blaenau Ffestiniog, where a local boy has fallen off an old railway bridge onto rocks.
Prince William at the controls of a Sea King helicopter
BBC series 'Helicopter Rescue' follows the RAF's search and rescue crews from RAF Valley on Anglesey, and RAF Chivenor in Devon, as they are scrambled to locations across the country to help people in trouble.
Members of the RAF search and rescue team
Along the coastline and up in the mountains of Wales, the RAF's yellow Sea King helicopters are a familiar sight.
A Sea King helicopter
Within the RAF, Prince William is known as Flight Lieutenant Wales.
Prince William
You can watch Helicopter Rescue on iPlayer, or if you live in Wales, it's on BBC One Wales on Monday nights at 8.30pm.
Prince William
Prince William told Helicopter Rescue that he takes great pride in his job as a search and rescue pilot. "There's no greater feeling than when you've actually done some good and saved someone's life," he said.
Prince William