|Fiona Lincoln and Mark Stephenson|
Their route will take them across London, following the Thames Path past Hampton Court and Windsor Castle into Oxfordshire, then through the Cotswolds and Staffordshire until they reach Birmingham.
They plan to cover the 120 miles by this Friday, when the Outdoors Show opens at the Birmingham NEC.
The show is running the Clothes for a Cause appeal encouraging visitors to bring their old walking gear and equipment to be donated to Oxfam and re-used in foreign aid projects.
Mark Stephenson said: "We are planning to walk the entire distance wearing only hiking boots, socks and a rucksack to raise awareness for the appeal.
"As naturists we are completely comfortable in our own skin and will only cover up in adverse weather conditions, or if we are asked to do so when passing through populated sections of the hike."
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