Callitula pyrrhogaster
This was found by suction. I couldn't find a key to identify it against but it compares well to photos of this species online. A couple of websites said that it was a distinctive species which implies that if it look like one probably means it is one. I asked around (via BlueSky) and so far the only response suggested that there aren't any confusion species. It was 1.5mm long and had vestigial wings.
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Callitula pyrrhogaster, Wendling Beck Environment Project (Norfolk, UK), 30th July 2025