On 30/11/2016 11:48, DICEGEORGE wrote:
I seem to recall reading somewhere that in 2 way switching for house
lighting its a good idea to have a neutral wire parallel to the
lives to cut down on interference, is this so? In which case I need 4
core and earth not 3 core and earth.

I is mentioned at:
http://wiki.diyfaq.org.uk/index.php/2_Way_Switching

[g]

I have only ever used the "Alternative method of Two Way Switching" on
that page .. adding intermediate when needed