They have Private speed cars operating have been since 2018.They are currently in eight regions: Normandy, Brittany, Pays de la Loire, Centre-Val de Loire, Nouvelle-Aquitaine, Grand-Est, Bourgogne-Franche-Comté and Hauts-de-France but the plan is for them to be rolled out to all regions of France by the end of next year. The tolerance they have is 10 percent on motorways so double the fixed cameras.

and they will find you! I got 2 from 2020 with pic of driver and speed and fine. Al sent in one lovely letter to my Uk address!

As of 2021, there is no more data sharing with French police, so now you are safe….

Don't speed. simples

From connection newspaper --Drivers with UK number plates will not receive fines issued by speed cameras at their UK homes, as previously, as the exchange between Britain and France of this sort of information came under an EU directive and ended with Brexit.

They are not marked. And while they do look similar to normal cars, they do have an “eye” camera to the rear, which looks like a black square. They also have two small cameras that are visible through the back windscreen, unless the rear window is tinted. At night, the infrared detector can be seen via a series of small red LEDs.

There is also a large black box placed on the dashboard at the front, which contains a camera and a tablet for the driver.

Sandyt wrote:

From connection newspaper --Drivers with UK number plates will not receive fines issued by speed cameras at their UK homes, as previously, as the exchange between Britain and France of this sort of information came under an EU directive and ended with Brexit.