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Tony, Does that mean the larva isn't the one that turned into this fly. I did find a rather squashed specimen of a different species in the container with the fungus. Maybe that was the Mycetophilid adult?
mossnisse, I can't find a S nigricornis, but there is a S atricornis in the UK list. But that species has humeral seta according to Phil Withers key to British Suillia...