I'm driving down a few days after you..
GB sticker is now UK, you need one of these. I have picked up a 'bipper', like a dart tag so that you can cruise through the tolls at up to 30kph, it charges to a card so you don't have to queue up.
Also need, for a car, might be different on a bike..
Headlight stickers
High Vis vests for each person travelling
Warning triangle
Spare bulb set
V5 reg cert
This website is a good guide in case I've forgotten anything https://www.rac.co.uk/drive/travel/country/france/