Just found this article about the effects of wind turbines,fossil fuel stations and nuclear stations on avian mortality.
It concerns the US but would be relevant here too.
http://www.nukefree.org/news/avianmortalityfromwindpower,fossil-fuel,andnuclearelectricity
It's not always easy to hug a hedgehog.
But that doesn't mean you shouldn't.
Well the RSPB are going to build one next to their head office so I doubt they consider them to be bad.