It said the number of cars produced for the domestic market was up 21.1% to 33,813 units and the market was positive "with UK manufacturers poised to see return on billions of pounds worth of investment".
Mike Hawes, SMMT chief executive, added: "The outlook for the car manufacturing sector continues to be upbeat. More than a quarter of a million cars have been made in Britain so far this year – a steady performance, which has been led by a strong domestic market.
"The UK's appetite for British-built cars has consistently grown, with the number of cars produced for the home market increasing 51.9% since 2011. However, political instability abroad has hit certain export areas which will invariably have a small impact on total output."
