France doesn't require them unless you are entering their inland waterways - in which case you need the CEVNI endorsement.
I was once asked for one when launching, despite it being in the upper reaches of a tidal river (below first lock). At the time I got the impression that this particular guy would have asked for anything he could (not my normal experience there though).
Was asked for ICC and insurance on both occasions I launched in Marinas in Spain.
it seems to depend on the boat - and you are defintiely of interest with a nice big targa.
Last week, i arrioved in roscoff and a quartett of Douaniers arrived on the boat inside an hour. Same thing in Brest. But it was passports, boat papers and hidden drugs they wanted to see - not qualifications. That wd be Gendarmes.
But i wd do a qualification anyway - whats the prob getting someone along to confirm you know wot you are doing? It's only £200 or less on own boat. I have never ever had an rya instructor on board and failed to learn summink new.