I think Half-baked boy is right. I have a farm with electricity wires crossing one part, but no pylon on my land. I am pestered by firms offering to act for me in seeking compensation. I dislike the "ambulance chasing" culture and it would be hypocritical for me to seek compensation for something that was there when I bought the farm.
See here
Can I get compensation for the adverse effect of electricity power lines
Compensation could be available without a pylon on your land, it seems