These are small grey-white winged insects related to lacewings. They are often known as waxwing lacewings or dustywing lacewings. The wings have a dusty appearance caused by a white waxy substance which the insect produces itself.
Widespread in Britain.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015