Common Darter, of course it it. I am just checking because I haven't noticed bright blue legs before. Real or a trick of the light?
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Some blue-grey pruinescence does sometimes develop on darters, generally on older individuals. This is usually seen on the lower abdomen, underside of the thorax, and perhaps legs, but is occasionally more extensive.
Lat/Lng: 50.9, 0.6
OS grid ref: TQ8823