Following my report on Friday's visit to Fermyn, a couple of people suggested that I might post more photos of the gathering of the three emperors high up in a sallow, so that the story of the squabble might become clearer. So, here are all 12 of the shots including the original photo, apologies if that's a bit too many, but I'm not sure which are the key ones. The overall situation was that there were two Emperors doing a lot of flapping, another came over to investigate and the photos cover the next 50 seconds, spaced every 4 seconds or so in chronological order. Finally two of them flew off in the same direction.
irisscientist - thanks for the photoshopped image to enhance the purple - that's a useful technique that I'll have to remember!