When you say "European", please also say "excepted UK" who (like usual) does things differently. E.g ring cabling.
https://en.m.wikipedia.org/wiki/Electrical_wiring_in_the_Uni...
https://en.m.wikipedia.org/wiki/Electrical_wiring_in_the_Uni...
While Japan is an island, I would not consider it part of continental Asia, although that might be less of a common concept than continental Europe.
Hasn't that always been implied? IIRC, just about every story I've heard that includes both has always used some variant of "Europe and the UK" to indicate that.