I missed David's reply so I cannot comment on it.
You have it right, Elaine! Overtaking in your rhd car involves more calculation & consideration than it would if you could just ease your eyes slightly to the left without projecting half your car into the path of oncoming traffic. You are aware of the extra risk & allow for it. But there is no denying that there IS an extra risk. If there wasn't there would be a thriving export market of used UK cars to Europe.
There are many reasons why Brits bring rhd cars with them when they move here which I'm sure make perfect sense to those who do. Provided that the vehicles are then put into the French system rather than put on a SORN (complete with invalid UK address, expired MOT & dodgy or nonexistant insurance) I have no issue with it. Most of these people are aware of any problems & compensate for them.
My big issue is with the few who drive UK registered rhd cars here for years. If these are involved in an accident (& as a user of the same roads it could be with me) who pays?
A local Brit bought a very tidy car in the UK a few years ago & brought it over here. It rarely went out in the rain. This New Year he left the road on his way back from a bar & the car rolled a few times. It was taken to a local scrap yard. I asked the owner if he had any problems with his insurance as I supposed the MOT would have expired? None at all, he replied, "I take the car back to the UK once a year for the MOT". It is possible to check a car's status online with the DVLA -the car was on a SORN, had not been taxed since 2011 & the MOT ran out in May 2012. I doubt that he had any insurance but if he had it would have been difficult to explain how it ended up in a ditch in France when it should be in a private parking space in Essex!