There you go again Paul.  There is no such thing as WM approved mains wire   Yes, he does use some pretty pricey mains cables but before that he was using Eupen power cords and singing their praises.  Eupens go for £48 a metre, so you'd need a hell of a lot of bits of kit to make them add up to £700.

I also use Eupens in my system and the difference they made is nothing short of stunning.  Others have reported similar results.

Michael.