Clarkson mentions the Botswana special from Top Gear 2007 as being their first ever special; it wasn't, it was the fourth special, preceded by Winter Olympics, USA and Polar.
When James is about to enter Botswana at 1:52:09, he touches the steering wheel and exclaims that it's hot. However moments before this at 1:51:30 he gets out of his car while touching the steering wheel with no issues.