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Kirsty Young's castaway for the 70th anniversary edition of Desert Island Discs is Sir David Attenborough.

He has seen more of the world than anyone else who has ever lived - he's visited the north and south poles and witnessed most of the life in-between - from the birds in the canopies of tropical rainforests to giant earthworms in Australia.

But despite his extraordinary travels, there is one part of the globe that's eluded him. As a young man and a keen rock-climber, he yearned to conquer the highest peak in the world. "I won't make it now - I won't make it to base camp now - but as a teenager, I thought that the only thing a red-blooded Englishman really should do was to climb Everest."

Producer: Leanne Buckle.