As what Ste has said above, try and stick Shell V power or Momentum 99 as they're mapped to 100 RON from the factory in Japan. In saying that, and I'm going to court controversy here. All my Hondas and this is the fifth Honda I've had have all gone better off Asda fuel, 97 Ron. The cars seem to have more pull and the engine seems to rev better than with some of the more expensive stuff. I find Tesco 99 the car runs particularly lumpy. Obviously you shouldn't stick 95 or 97 fuel in regularly but my car goes well off it. If you can, try and buy some Fortes fuel cleaner as it's excellent. Just chuck it in with a full tank.
