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this damselfly is missing the feather-like expansion of the hind tibia so likely not the white legged damselfly but hard to pin it down from the side
Damselflies like the Common Blue and Azure Damselfly also often have very pale or white legs. Like Rob says, the White-legged Damselfly has expanded tibia (most prominent in the male), they also have far more restrictive black markings on the dorsal side of the abdomen + more stripes on the thorax.
This is one of the Coenagrion damselflies because it has two black spurs on the side of the thorax (only one on Common Blue). It is almost certainly an Azure based on range and the extent of the blue on the abdomen segments, + other small characteristics.
The White-legged Damselfly ID I entered (repeating the ID already) given was a mistake - I realised as soon as I pressed enter, but ID's can't be deleted!
Lat/Lng: 51.4, -2.7
OS grid ref: ST5469