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It's a female damselfly, and I think it must be one of the demoiselles, but I can't tell whether this is Beautiful Demoiselle or Banded Demoiselle. Males are much easier!
Entomologist and biological recorder
It is very hard to tell the body colour from the photograph but generally with both species the males have blue bodies and the females are green. The beautiful demoiselle female is always a strong green colour but the banded demoiselle females can be more a muddy green colour.
As a general rule of thumb beautiful demoiselle hang around fast moving water and banded demoiselle around still or slow moving water. Can you remember the water's speed?
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I was on the British Dragonfly Society web site this morning and looked up the demoiselles. They have a picture of a beautiful demoiselle female which is a rich bronze/green colour just like your photograph. On that basis I would come down on this being a female Calopteryx splendens.
You can check for yourself by following this link:
I must go down the river Derwent where I know there are C. splendens and have a look for myself. I've always thought of them as being green rather than this bronze/green colour; perhaps its the light.
I agree with Graham that there is a tendency to different colours and different habitats between these two species, but they don't always follow the rules! Would be good to find a male to confirm it.
It's not a good idea to seperate the female demoiselle on body colour - the bronzy colouration shown in your photo can be seen on females from BOTH of the British species - and also on Emerald Damselflies. It seems to be age related, with older females having more of a tendency to have bronze coloured bodies.
There are other minor differences that can be used to seperate the two (such as the precised position of the false pterostigma) but there is a degree of overlap in most of these.
The posted photo probably shows a female BANDED demoiselle, C. splendens, (I assume The Naturalist Man, Grahams suggestion was a typo) - which would fit well with the male you posted later from the same site!
Lat/Lng: 51.4, -2.5
OS grid ref: ST6570