Hairy Snail - Trochulus hispidus
Shell 6 mm. The hairs on the shell wear off, but can usually be seen inside the umbilicus, which is quite well defined in this species. It is relatively flat, lacking a noticeable spire.
Ashfordia granulata is the other hairy snail in the region. This has a smaller umbilicus and is more conical in shape.

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
All year round
Widespread and common throughout most of Britain.
Common 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