Only Motors’ resident non-driver, ‘Tall’ Tim Denning is challenged to drive an unstoppable, scenery-bashing leviathan: a high-rise, four-wheel-drive Mercedes Sprinter van.

Tim heads to 4×4 Berkshire to get his eye in on a beginner-level off-road course before heading to the fearsome Millbrook Proving Ground where his skills will be put to the test in extreme conditions at the wheel of the Sprinter.