Flu in five charts - how this year's winter outbreak is different
Zoe Langley-Wathen, 54 , and Mike Langley, 73, aim to raise £10,000 for Dorset and Somerset Air Ambulance over their 7,300-mile (1,1748 km) journey.
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"It's very serious and not to be taken lightly."
"We are quite different people - very much yin and yang - but I think decisions are better made with two brains rather than one as it stops hubris," says Begg, who is London-based.
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