In Europe (EN 60446, HD 308S2):
Phase R - brown Phase Y - black Phase B - grey Neutral - blue PE - green-and-yellow
In UK (BS 7671), till 31.3.2004 (overlap till 31.3.2006):
Phase R - red Phase Y - yellow Phase B - blue Neutral - black PE - green-and-yellow
From 1.4.2004 (overlap till 31.3.2006, compulsory from 1.4.2006:
same as Europe
See my posting of Mon, 14 Jul 2003 21:46:51 +0100 (BST)
The IEE has established a "Cable colour changes" website atwhich includes links to guidance documents and the draft amendment to BS7671 Identification by Colours.