I think it is possible to try, but usually local authorities get away with it when it comes to pylon's etc... they just turn around and say without it, he would'nt have electric lol.
But... if he has to substantially lower the price of the home against a realistic market to sell it, then someone should pay for it, and it should be the authorities.
No harm in ringing up and seeing what they say; although I have seen cases on TV where the council have just come along and plonked a Pylon right next to a house after the owners have developed it.
Who was there first, the pylon or you're father, as it may make a difference?