Eight Go Rallying: The Road to Saigon Episode Rating Graph

The celebrity pairs are plunged straight into the busy rush hour of northern Thailand's biggest city, Chiang Mai, with only an obscure Tulip Map to guide them onto the open roads and up over the phenomenally steep Chae Son Hills.

The duos are back on the road after two of the cars were taken out of action in the first leg. To avoid getting left behind they must all make a dash for the border, as the whole rally has to pass into Cambodia by early afternoon. Then Noel and Liz and Andi and Miquita must drive into the night on the country's challenging roads to reach the tourist mecca of Siem Reap.

The teams head towards Phnom Penh, at the start of a three-day journey across Cambodia totalling an eye-watering 900 kilometres. The first day of the journey through the rugged countryside is broken up by a pit stop at the official rally lunch stop - a market which sells insects and spiders as snacks.

Having made it to the South China Sea all the teams have the finish line in their sights. But with 800km before they reach the chequered flag anything can happen.