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This is a female Large Red Damselfly, Pyrrhosoma nymphula, of the melanotum colour form, which is largely black.
If you look closely you can see some red on the abdomen on the top two images, & the yellow stripes on top of the thorax are typically much shorter on female Red-eyed Damselflies.
Details changed for Pyrrhosoma nymphula
identification. Appreciate all input.
Lat/Lng: 50.400723748355, -4.0994024276733
OS grid ref: SX508577