The latest figures from the Society of Motor Manufacturers and Traders (SMMT) for June show a further decrease in the sale of new cars.
The number of new registrations last month slumped to 183,125 compared to last year.
Sales were 6.2% down, with car insurance companies likely to have noticed a fall in demand for policies to cover new motors.
However sales of commercial vehicles held up well, with 25,968 being sold in June, up 12.7%. Of these, 22,850 were vans - up 13.5% on 2010 - a welcome boost for specialist van insurance providers.
The first half of 2011 saw a total of 1,029,638 cars bought, a 7.1% drop compared to the first six months of last year, which saw a boost due to the Government's car scrappage scheme.
With June being the 12th month in a row to see sales drop, the SMMT is predicting the year-end total will fall from 2010's 2.03 million to 1.93 million in 2011.
Paul Everitt, chief executive of the SMMT, said: "June new car registrations continued to perform in line with industry expectations, with robust demand in the fleet sector and a relatively weak retail market."
However, diesel car sales rose by 4% last month and are up 7.5% on the first half of last year.
© Press Association 2011