I'm ( obviously ) no rotary wing type, but I thought there were systems in place to avoid flying into pylon wires - hell, I might even manage it with dowsing rods !
My local village - not too far from Odiham - has regular Lynx & Chinook over-flights, unlit so presumably NVG's at night, some at low enough level to seem like taking the roof off.
( there's a nasty tall T.V. mast nearby ).
I have my own NVG's so enjoy the display, but some NIMBY's have objected, so Odiham are hopefully going to put on a P.R. display in the town hall.
This doesn't answer why the Lynx hit the cables, I thought among other things modern aircraft GPS makes a point of showing such things ?