A soldier fly with a small, black, rounded abdomen, clear wings, femora mainly yellow and bases of the antennae are orange.
See Martin Harvey's photo ID guide.
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.
Well wooded areas with Oak and Elm.
Fairly frequent in southern Britain as far north as the Humber.
Fairly frequent in Leicestershire and Rutland.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015