Now I understand why I have just paid a speeding ticket alleging 1km over the limit.
The actual speed limit was 80 km, It seems I was clocked at 86 km and so the speed used for the offence was 81 km.
That makes me feel SO much better, now I understand.
I think the wonderful French are making the most of their connections with DVLA, fearing possibly that if we leave with no treaty they will loose the right to seek contact details.
Not wanting any problems when we go over in September, we decided to cough up straight away, and avoid possibly being placed on a database of rogue vehicles.