Independent data from JATO Dynamics also showed April sales totalled 163,216 units, a fall of 9.1% compared with April 2005.
The overall European market for new cars rose by 0.7% compared with the same period in 2005, to a total volume of 5,461,204 units.
Total new car sales in the EU in April were 1,279,008 units, which was a decrease of 7% compared with April 2005.
The largest market in the region in the first four months was Germany, with total new car registrations of 1,082,019 units. The fastest-growing new car market was Latvia, where sales were up by 55% compared with the same period in 2005.
Diesels accounted for 305,300 new car sales in the UK in the first four months of 2006, or 36.7% of the overall market. This was a rise of 0.9% compared with the same period in 2005.
Diesel models' share of new car sales in Western and Eastern Europe in the first four months of the year was 49%, which was an increase of 0.5% compared with the same period in 2005.
The top-selling model in the UK in April, with sales of 9,348 units, was the Vauxhall Astra.
Table1: EU and EFTA top selling brands April, April YTD 2006 and change vs. 2005
Table 2: EU and EFTA top selling models in April, April YTD 2006 and change vs. 2005
Table 3: New car registrations in the EU-EFTA area by segment, April 2006 and April YTD 2006
Table 4: Confirmed new car registrations in the EU-EFTA area, April and YTD 2006
(NB: All percentage figures given are for the period vs the same period in the previous year unless otherwise stated. For instance "sales rose 3.7% in April" refers to a rise of 3.7% in April 2006 compared to sales during April 2005.)