I know Hong Kong used British fittings (both BS546 and BS1363), but I believe that their nominal voltage was 200V rather than the more usual 220-240V. I say "was," because I don't know whether they've changed the system in recent years.

I also understand that India still has some 3-wire DC distribution in a few areas, along with various nominal 3-phase AC systems: 220/380, 230/400, 240/415, 250/433. The 15A BS546 plug is still standard there.