Just checked out snails on Wiki p.

England, southern areas on chalk.

It is not native to the British Isles. It was introduced to the British Isles by the Romans during the Roman period (AD 43-410); its common name in the UK is Roman snail.

In England only (not the rest of the UK) the Roman snail is a protected species under the Wildlife and Countryside Act 1981, making it illegal to kill, injure, collect or sell Roman snails.

So if we eat any, we go gaol?