Aha, Friday morning to Sunday evening, getting closer…
Suggest for a first foray, take the Shuttle to Calais, go down the D940 to Boulogne, then head due south, ignoring all signs to large towns, and do NOT go on autoroutes. Stop when and where you will, relax and chat, don’t worry about going far, enjoy France.
Second foray might be Portsmouth-Cherbourg, and exploring that very Anglo-friendly peninsular.
By then you’ll have met a few French bikers, you’ll be on their forums/mailing-lists, and not have any future worry.
Your third trip might be quite wild if you met the right bikers over there.
(And there are LOTS of ex-pats willing to help, UKRM is a pointer.)