[MovedGoalPosts]

Best answer here is to write, recorded delivery, to ntl, copied to your freeholder / management company, stating that the wires are incorrectly routed over land / property that ntl will not have legal rights over. Require ntl to remove said cables, and make good all damage. Your managing agent / freeholder should back you on this.

Might be worth having a friendly word with your neighbour over this. Very easy to start a falling out, that creates on going bad feeling, or worse.