Orthetrum

You have an Orthetrum (Skimmer) species. The UK has 2 resident Skimmer species, the males of which both develop powder blue pruinosity which causes their appearance to vary dramatically with maturity.

Their pterostigmas are, however, more consistent and distinguish them nicely.

Black pterostigmas, light costa: Black-tailed Skimmer (Orthetrum cancellatum).

Light (yellow) pterostigmas: Keeled Skimmer (Orthetrum coerulescens).

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