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They could not use their smart phones or bank cards while seeking out their own transport, food and accommodation.

Police Scotland said Cole had not used his phone or bank cards in the time he'd been missing - something Connor said he found particularly worrying.

The aim is to be the first contestants to reach the finish line at the southernmost tip of India, in Kanyakumari, without using smartphones, bank cards or flights.

Without phones, flights or bank cards, this year's pairs must travel more than 14,000km - starting at the Great Wall of China and finishing at Kanniyakumari, the southernmost tip of India.

Teams of two race to get from one part of the world to another with no air travel, no smartphones, no bank cards and a limited cash budget.