White-legged Damselfly (Platycnemis pennipes)
A small, uncommon and under recorded damselfly in the UK, easily mistaken or overlooked among more prominent blues.
This photo demonstrates its most distinctive feature, the feather-like white streaked legs, also visible in this video, accompanied by some additional species information:

The white-legged damselfly or blue featherleg is a damselfly of slow-flowing, muddy waters. It occurs from the Atlantic to Siberia and is often abundant throughout its range.
Similar species: Dragonflies And Damselflies
By Philip Booker
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Uploaded Dec 4, 2020. Captured Jun 1, 2020 16:13 in Old Station, Barcombe Mills, Lewes BN8 5BP, UK.