Simon Benson, director of motoring services at AA Cars, added: "The SMMT warned last month that if the government failed to intervene, the new auto market would continue to suffer, and sadly that proves to have been the case today".
Overall numbers were down 11% on the same month previous year, although the majority of these losses were for business and fleet buyers.
The decline was mostly driven by a sharp drop in sales of new diesel cars, which fell 30.6% from the corresponding period 12 months earlier, largely because of the confusion and speculation about the Government's air quality plans and its policies towards diesel cars. Petrol vehicle sales are 3.1% up so far on 2016's figures.
Just over 163,500 new cars were registered in November, down 11.2% against the same month a year ago as diesel sales fell 30.6%.
As usual, the SMMT has no compunction in blaming the government for falling diesel sales, although disappointingly Brexit fails to get a mention this month.
A total of 163,541 new cars were registered last month, and although the overall numbers were down, sales of petrol engined cars rose by 5 per cent to 92,944 - an nearly 57 per cent market share - and those of Alternatively Fuelled Vehicles (AFV) rose too by 33.1 per cent to take a 5.4 per cent market share.
Overall, the Ford Fiesta remained the bestselling vehicle of the year in November. The Volkswagen Golf was the second best-selling vehicle in November, followed by the MINI, the Ford Focus and the Nissan Qashqai.
United Kingdom new auto sales have skidded lower for an eighth consecutive month, entirely from falling demand for diesel vehicles.
Crossovers continue to dominate too, with the Qashqai, Sportage and Kuga all finding themselves in the monthly top ten once again. More of the same is likely across the board as every brand looks to offer alternatives to unpopular diesel offerings. There is still a long way to go, but it is likely that 2018 will see even greater growth as more manufacturers bring new hybrid and electric vehicles to market.
China has no intention to interfere in Australia's Internal Affairs - foreign ministry
The Australian leader appeared confident about what he said was the most significant overhaul of espionage in decades. The new laws would apply to organisations like GetUp, the government also confirmed.