Oooops, yes you are right, just never expected to see one here!
I think this is actually the Short Eared Owl that has been resident at Otmoor for a few weeks. It was in a tree in an area quite near to the car park, visible from a gate next to the track on the day I visited. The man who pointed it out to me had seen it in exactly the same spot the previous day. A rare and lovely bird to see.
Seen at Otmoor this morning 27/1/2017. Courtesy of a couple that had seen it and pointed it out to me. :-)