Im pretty sure your U.K. regular fuel has a octane rating of 95, while us Americans are still in the 80s with 87 octane trying to make these modern engines run on it. That would be the answer to me for the difference. My 17 EXL has been on 93 octane since it had 3200 miles and has 35000 now. No measurable OD since I switched to premium 93 octan.You're welcome to take it with whatever you want.
Fact remains, unlike the USA which has had OD issues, over here in the UK, its been silent. There may well have been cases, I dont deny that. But nowhere near the extent to the North American market.
Also, our CR-Vs are built and sourced in Japan. Could there be a superior build process there? Almost certainly. Thats not to detract from the honest hard Honda workers in the USA, but we all know the detailed scrutiny and excellence Honda manufactures its vehicles in Japan, and they are always going to be leagues ahead of non-Japanese Honda plants.
So as said, take it as you wish.