British new car sales recorded their biggest drop since 2009 last year, falling by more than five per cent due to uncertainty over potential new diesel charges and weakening consumer confidence since Brexit, an industry body said last week.

Registrations ended 2017 at around 2.54 million vehicles, according to provisional data, and are set to fall up to seven per cent this year, the Society of Motor Manufacturers and Traders (SMMT) said.

Demand for diesel cars fell 17 per cent as consumers were put off by potential new charges, pushing up average CO2 emissions for new cars for the first time in two decades as some switched to petrol.

Last year’s drop in total sales is the biggest since demand nosedived in 2009 in the wake of the financial crisis, but comes after two years of record highs in 2015 and 2016.

Sales in December fell 13.9 per cent and SMMT chief executive Mike Hawes said further declines were likely over the next few months.

“The two main reasons are business-led and consumer confidence and the confusion around diesel which has caused hold-off,” he said of last year’s fall.

“The first quarter is going to be tough and March (last year) in particular was an all-time record month. We ain’t going to get that next March.”