Silpha atrata (St Davids, Wales)

It is around 15 mm long with a shiny appearance and broadly spaced ridges along the length of the elytra. A red form of this beetle occurs and can sometimes be common in certain localities.
Common in many different habitats including woodland, meadows and gardens. It can sometimes be seen resting under logs and debris with its head tucked under the pronotum.
When to see it
January to May.
Life History
Sometimes called the Black Snail Beetle, this species does indeed specialise in feeding on snails and has a narrow head adapted to this role. The larvae also feed on pulmonate snails and earthworms…Naturespot

There are photos of the common black and the rarer brown beetle