PPO2 1.4 at 21% gives MOD 56mtrs /187 ft. France does not recognize many international qualifications, you think they do because they offer courses and diving with Padi or SSI flags and courses, but in reality you are under French dive regulations as the guide/instructor has the obligatory French national dive instructor qualification and is responsible for you.
France does not recognize any other qualification for dive instructor except their own national standards per code du sport A322-77, must be obtained through one of the 5 main government CREPS centers. This is not compliant with European law forcing inclusivity and standards recognition, Padi took France to the European court in the 2000s and won, so there is now an equivalency process to obtain the French BPJEPS, DEJEPS or DESJEPS qualification, but it is so complex and discriminatory that almost nobody with international instructor quals does it. Not worth the hassle or cost vs living/salary in France as a dive instructor compared to Thailand, Indonesia, Mexico, liveboards etc.
Good French diving marine reserve around Port Cros and Hyeres islands, Corsica, but expensive and doesn't compare to eg Malta. New Caledonia, French Caribbean or Polynesia are great, marine life in the Med has declined so much in the last 30 years.
In the 70s BSAC did not differentiate, deco was part of dive learning from the start. During my first week dive course (PASS dive agency, doesn't exist now) we dove to 30 ft, left the tank and reg on the bottom, forced ascent (with fenzy) back to the surface, then freedived back down to put it all on again. Things were different before Padi created recreational diving.