Last year, Top Gear was censored by the watchdog for breaching broadcasting rules after Clarkson used a “racial” term during the programme’s Burma special.
The year ended with the motoring show’s crew forced to flee Argentina after it emerged they were using a Porsche with the registration number H982 FKL, which some people suggested could refer to the Falklands conflict of 1982.
Top Gear remains the world’s most-watched factual television programme, seen by viewers in more than 200 countries around the world.
But each episode in the two-part Christmas special attracted more 7 million viewers last year, with a further three million viewers tuning in for each episode on iPlayer.