The IEE in Britain seems to have always been quite opposed to 3-phase in residential environments.   Where 3-ph is used (and it would be a VERY big house, maybe a large guest-house or something like that), then they have rules regarding such things as the placement of phase barriers in boxes, ensuring that all sockets in one room are on the same phase, etc.  
Our friends across the Big Pond may well feel uneasy at residential being 240V to ground, nevermind 415V 3-phase!
[This message has been edited by pauluk (edited 03-21-2003).]