A fly with brown mottled wings, a pale brown abdomen and greyer thorax.
Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.
The fly is apparently associated with Oak woodland.
Peak is April to June.
It seems to be infrequent, though widespread in England with very few records from elsewhere in Britain.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015