According to research, as is nears the end of its six-month run, the 13-plate has overtaken all previous plates dating back to September 2008, having been registered to 1,115,459 vehicles since it came into use in March.
As the new 63-plate changeover nears, manufacturer main dealers are preparing for new vehicle deliveries, which according to SMMT could see around 390,000 new cars on the road during September.
These figures mean roughly £6bn is expected to be spent on new cars.
SMMT interim chief executive, Mike Baunton, said: ‘We have seen a strong performance from the new car market throughout 2013, with the number of cars registered increasing in July for the 17th successive month.
‘Now we have evidence of consistent growth, we have raised our forecast for 2013 new car registrations to 2.216 million units, an increase of over eight per cent on last year. In line with this positive trend, we expect the new 63-plate to be very successful and for September registrations to provide a similar peak to that seen in March.’