from my numerous rides there

ohhh...I can't wait for one we plan in August...
some info - may be useful... I hope...
If cage letting you pass as described in previous post - just for kind of ethical rule you shuld either pass or not hang out near left side of lane. General rule in France is that if cager see you moving towards center of road then you must be wanting to pass, and he will let you go.
So what happens when you do not know it - cager keep moving right, you not passing, he gets pissed and will not do it again. So - better to keep to that ethical principle ;)
About police. If you see gendarmes on highway it is very likely they mind their own business. Idea is - in France gendarmes are local, so if they enroute to somewhere not in their district - they never bother doing anything. Only on their own territory.
Important is to watch out for national police. Mainly on bikes. These guys are serious, and seriously cool - they will probably catch you even on their bulky Beemers, they are propoerly skilled riders. And they take no prisoners, unless they are in good mood. But in rural parts they do not mind too loud pipes and mods as long as numberplate is there and you do have indicators. In cities it is worse - you may get pulled for about same as in UK.
And - when you go to "racy" roads - at beginning do not try to catch on with locals, they are properly mad and can override any foreginer. Best one I saw was guy on old beemer using sticking out cylinders as sliders on alpine road - not occasionaly, I mean ALL THE TIME. He overtook 2 my mates on Blackbirds in first corner like if they werent' moving!!
In France riders do not do "Aye, lad" nod, they show 2 fingers or wave with leg if hands busy with controls. In France normally ALL riders greet each other...except H-D agricultural chromed museums riders and often Goldwing riders.