Ben Fogle undergoes an intensive course of treatment for a lethal tropical illness.
BBC Two Scotland only
After resting halfway, the team races in -40 deg C temperatures to reach the finish line. (R)
BBC Two except Scotland
Jonny pulls out due to work commitments, leaving Ben and James in need of a new team mate.
The team get off to a flying start in the race, and quickly take the lead. (R)