Is this the species that parasitises Small Tortoiseshells?
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I don't know what it parasitises but it looks like it has been killed by Entomophthora
University of Edinburgh and Biodiversity Observatory (OU)
Definately not Sturmia bella - far too "hairy".
Tachinid Recording Scheme
TRS Facebook Page
Looks like Pollenia sp.
Lat/Lng: 53.8, -3.1
OS grid ref: SD3138