Same. Probably some hot-shot that thought they could avoid hitting the blades. Given the cost of the repairs, I would also pick up the wreckage and leave ASAP.
Model aircraft? I live not far from linconlshire and these are the exact same turbines used outside of Glasgow Scotland and lemme say these blades are massive, it would take a large aircraft to do damage like this, and an aircraft would eat dirt after hitting them. The only logical thing I could see doing this is a helicopter..