You may be interested in my experience with CP Plus when they fined me for overstaying my time at a service station on a motorway. They wrote that the DVLA had told them either I was the registered keeper at the time of parking or that the registered keeper had named me as the driver at the date and time of the event. I replied that I was indeed the keeper, but I could not remember who had been driving at the time. It was either myself or my husband, but neither of us could remember which one. It was possible that one of us drove in and the other drove out.

When threatening letters later arrived and the penalties increased, I reminded them of my original letter and told them that, as they were ignoring it, they had no cause to increase any charges. I was prepared to get as threatening as they were, but this was not needed. After returning three letters to them with comments on the bottom saying "refer to my letter of (date)", I received a letter from them stating that they were not proceeding with the fine. If any of your readers have confusion about who might have been driving their car, they ought to pursue this line. Hope this helps someone.