Ops below 500 feet
Thanks all for your considered responses - keep them coming and also noting any locations of these anemometers would be helpful too.
A lot of windfarm developments are on open moorland. We are all quite entitled to fly around at low level so long as we avoid any person, vessel, ve-hikel or structure by at least 500 feet - I would suggest that persons (particularly in bright orange kagouls), vessels and ve-hikels are usually easier to spot than these camouflaged brown skinny masts in the middle of nowhere.
Quite apart from the hazards to our fast pointy brethern, and the apparent absence from NOTAM activity.