The timing and duration of summer shutdowns at certain plants also pushed down output, which stood at 37,246 cars, according to the Society of Motor Manufacturers and Traders (SMMT).
There were big drops in the number of vehicles exported to Australia, the United States and China, whilst sales to the EU were only down 4.9%, and vehicles destined for domestic buyers rose 3.3%, figures showed.
"Carmakers and their suppliers are battling to keep production lines rolling with constraints expected to continue well into 2022 and possibly beyond," said SMMT Chief Executive Mike Hawes.
