We keep getting buzzed by a really low flying military helicopter, and you can sort of see just how low it is in this picture.

This one has a bit more detail, but it didn't exactly hang around to let me take a better picture.

Apparently low flying helicopters aren't restricted to any kind of minimum height - they could in theory just hover a couple of feet over your back garden and you can't really do much about it - although when we did complain about them scaring the livestock, they happily told us you could claim £100 for every dead animal!.