I should have added that the U.K. also uses the 110V for building-site power tools, the same as DJK described for Ireland.
Just to clarify the situation, there is no main PoCo distribution at these lower voltages. Building sites simply use a portable transformer which steps down the incoming supply from our standard LV level to either:
(a) a single-phase center-tapped 110V supply, so that each line is at 55V to ground, or
(b) on large sites a 3-phase transformer running a 64/110 wye secondary with all tools connected phase-to-phase.
There are also odd uses of "foreign" systems outside their normal region in places which aren't really in any country at all. For example, some of the North Sea oil rigs are apparently wired entirely to U.S. standards.
