The number of new cars manufactured in July 2012 increased for the 13th consecutive month, with a rise of 22 per cent compared with the previous month and 15 per cent for the year to date, according to SMMT figures.
Of the 875,998 cars made in the UK this year so far, 82 per cent (719,804) were exported.
Commercial vehicle output fared less well, falling slightly in July and displaying a seven per cent decline overall for 2012 to date.
"Car manufacturing continued to perform well," said Paul Everitt, chief executive of the SMMT.
"While uncertainty in Europe remains a challenge, the £6 billion investment committed to the UK in the last two years delivers long-term growth opportunities and the latest figures show that our products have enormous global appeal."
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