So it's not a UFO, then.

Last night there was a sundog visible. You can see it as the bright coloured bit to the right of the Sun in the centre of the picture. It reminded me to put one of my favourite newspaper articles back on the wall of the lab. The purported UFO circles in the bottom right hand picture is actually a sundog. I was really pleased to meet the actual broken blade in person when I went to climb the wind turbine in Swaffham.