Just got back from France.
I think the official national speed limit on single carraigeways is 80kph, and if it is raised it will show 90kph signs. That's what appears to be the practice anyway, my Garmin satnav was generally correct but there are a lot of 70kph stretches dotted around which are not correct on the satnav, so you do need to take a lot of notice of the signs. Many towns and villages have a lot of 30kph (yes, that's under 20mph) zones.
Remember on roads with 3 lanes, 2 one way and 1 the other such as in hilly areas for overtaking slow vehicles, the limit on the 1 lane side is 80kph and on the 2 lane side it is 90kph. It does work OK.
Got back to Portsmouth last night, M27 closed westbound, works on the M3/A3, works on the A34. Welcome back to the UK.
Funniest thing was when coming back to UK the young lady in the French passport control asked me when I'd arrived in France, there was no entering stamp in my passport. I said the date and shrugged, a classic use of the gallic shrug I thought, what did she expect me to do about it. She looked at it, stamped it with the exit date, shrugged and wished me a good journey. Hopefully there is some other sort of record of when I arrived there, otherwise the 90/180 day thing could potentially be in question. We shall see.
Great now isn't it? (not).
Get a CritAir, it's simple and cheap and you've got it. Carry hi-vis IN the car cabin. Have "some" spare bulbs, it'll do. Spare specs if you wear them. All the usual stuff.
..... and take your good humour with you, it's very helpful at times.