Pre-1977 IEE	Pre-2004 IEE	Current IEC
Three phase: L1	Red	Red	Brown
Three phase: L2	Yellow	Yellow	Black
Three phase: L3	Blue	Blue	Grey
Neutral (N)	Black	Black	Blue
CPC (E)	Green	Green/yellow striped	Green/yellow striped

The standard colours in fixed wiring were harmonized in 2004 with the regulations in other European countries and the international IEC 60446 standard. For a transitional period (April 2004 – March 2006) either set of colours were allowed (but not both), provided that any changes in the colour scheme are clearly labelled. From April 2006, only the new colours should be used for any new wiring. with the regulations in other European countries and the international

The colour change has been controversial and was delayed for three decades, because the colour blue which was previously used as a phase colour is now the colour for neutral, and the colour black which was previously used for neutral now indicates a phase. While confusion in identification of these conductors could be dangerous, the combinations of colours used usually resolves ambiguities. The installation of cables with the 'new' colours in an installation where the 'old' colours exist, could leave the way open for confusion; it is important in such situations that consideration is given to correct identification of the cables – with the use of marker tags if necessary. It has also been suggested that the new phase colours are difficult to distinguish in low-light conditions, but the same can be claimed for most colour combinations, including the old British phase colours. A mnemonic advantage of the new colours is that the first two letters of "BLue" and "BRown" match the corresponding positions on the BS 1363 socket face: "bottom left" (neutral) and "bottom right" (live).

Above article is reproduced from http://en.wikipedia.org/wiki/Electrical_wiring_%28UK%29#Wiring_colours

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