It is not as though that this species is rare. It is common in Cornwall and I have pictures of it in flight but I have only seen it settle about 3 times in 25 years. It the UK's biggest dragonfly and once it is airbourne, then that is normally it for the rest of the day. This male settled just long enough for me to get off 3 rapid shots with my 80-400mm VR at the 400mm setting and I could not believe my luck when i saw the result. So although patience is a virtue, 25 years for a dragonfly is not very good for somebody who is supposed to know what they are doing. Best wishes. Bob F.