So What is The Most Popular Car in the UK? 21. May 2014 UKTrafficNews Driving Information, General (0) The most common car in Great Britain is the Ford Focus (I was very suprised to read that) of which there are around 1.5 Million are licensed on UK roads.The Ford Fiesta (not so suprised) comes a close second at 1.3 Million.UK Figures source, the DVLA for the year 2013.