“We both care hugely about the natural world, and David comes from a sailing background, so suggested we should sail, use the power of the wind, rather than fossil fuels,” Katharine told CNN.

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David's family had a sailing background but Katherine was a novice. "I completely trusted him," Katharine explained. "I had never sailed -- a couple of dinghy episodes before we set off.

“We both care hugely about the natural world, and David comes from a sailing background, so suggested we should sail, use the power of the wind, rather than fossil fuels,” Katharine told CNN.