Barred Snout - Nemotelus uliginosus
This is a cream and black patterned soldier fly, the males have more of the creamy colour on the abdomen than the females. Females of the species can be distinguished from the similar Nemotelus notatus female by the shape of the white bars on the frons. In N. uliginosis they are parallel-sided bars and in N. notatus they are wedge shaped

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.
Saltmarsh, waste ground and unimproved grassland, but usually coastal.
June to early September, peaking in July.
Fairly frequent and widespread in Britain but most records are coastal.
Occasional in Leicestershire and Rutland.
Leicestershire & Rutland Map
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MAP KEY:
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015