No, by definition I would save that much since I would not be parting with an extra 400 quid or thereabouts!

On a Sunday I often spend three or four hours preparing a meal; a semi-skilled job much like constructing a pair of loudspeaker cables. In neither case would I invoice myself for the time spent doing so!

Note. I have not said the retail price for your cables is unrepresentative of market price 3D, rather personally I would not pay anyone 600 quid for anything I could knock up myself for 200!

(that's it and no further comment!)