'We could always go overland now that we have wheels, ' Ross had suggested out of the blue. I'd pulled out an atlas and we'd traced a route down through Africa via countries still marked with their colonial names. Only two strips of water interrupted the flow of land between Edinburgh and Chingola; the English Channel and the Straits of Gibraltar. Fourteen months had passed since Neil Armstrong walked on the moon so Africa couldn't be that difficult, could it? A month later we boarded the ferry for Calais... In 1970 newly-weds Ross and Sara set off, with extraordinary naivety and a lack of...