Hayley Watkins

The race continues in Cambodia, where a spiritual journey leads the teams into the world's largest religious monument, Angkor Wat, on a search for enlightenment with a real-life monk.

The celebrity duos navigate the waters of an incredible floating village on the mighty Tonlé Sap Lake. At its Chong Kneas school, children teach them a song in the Khmer language. Then the teams must either farm or fish for local food staples.

Our teams clown around at the circus in Cambodia's second-largest city, Siem Reap. A fiddly floral task brings mud, sweat and tears. And one pair have a meltdown.

On beautiful Borneo, the celebs get hands-on gutting fish and dive headfirst into a conservation mission. But saving the planet takes a toll on our eco warriors.

Have our teams bitten off more than they can chew with Penang's local delicacy, bull's penis soup? Plus: shoe-making, and a gruelling uphill race to the finish.

Crabbiness creeps in as the celebs push on without a break, in a day of hustle and heat. But as the teams fly to Penang, it's the end of the line for one pair.