Don't like the idea of 415V for standard residential installations.
I have seen it occasionally, in really big houses or where there is electric storage heating with a load over 20Kw.
A lot of houses in the older parts of Inverness (pre 1930's) have a 2 phase & neutral supply. I am told this stems from the days when the supply was DC 3 wire. When conversion to 240/415V ac was carried out the existing paper/lead underground cables were re-used & many of these cables are still in service. Only 1 phase & neutral are normally taken from the service fuse to the meter, the other phase is left un-used.
Most imported stoves here also have 3 phase connections with copper links between the phases for 240V 1 ph use. I expect it enables the manufacturers to sell the same model in all EU countries & beyond.
