OP
Knobhead
I was on a job last year on a farm, gadgie had built a house and needed about 150 metres of 3 phase mains cable for the house and his grain drying shed, 2 poles and a tranny. He dug the trench himself, lined it with sieved sand, tiled it, taped it and back filled after it was all installed.
£50K
Seriously, that is cheap.