Ophion slaviceki
Ophion slaviceki is a large orange species (forewing 14‒17 mm); head with large ocelli usually touching, or almost touching, inner margin of compound eye; temple in female slightly shorter; male usually with temples more or less yellow.
Other Ophion species.

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.
Various habitats.
September and October, later flying than other Ophion species.
Under recorded n Britain, has been frequently misidentified as O. luteus.
Status in Leicestershire and Rutland not known as the species seems to be under recorded.
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