The new car scrappage scheme has notched up 378,978 sales, since its introduction in May 2009.
The scheme represented 12.2% of all new car registrations in March and 3.2% of the total van market in the same month.
SMMT chief executive Paul Everitt said: â€œFinal scrappage orders had to be placed by the end of March and already almost 380,000 vehicles have been registered out of the 400,000 available.â€
Since starting, the scheme has accounted for 18.7% of total new car sales, with average CO2 emissions standing at 132.9g/km, 27.1% below a scrapped carâ€™s figure.
Supermini models were favoured, 58.5% of all cars bought through scrappage fitting this category.
Everitt continued: â€œThe scheme has provided a hugely important stimulus to the market and leaves the industry in far better health than we saw in pre-scrappage 2009.â€