Are Slow Worms Dangerous?

Being most active at dusk, slow worms eat mainly slow moving prey such as slugs, worms, snails as well as the odd insect and spider. They do not bite people and are completely harmless.

Can you keep a slow worm as a pet?

Slow-worms are not at all suitable to keep as pets - as specialised reptiles they don't take to captivity very well and are far better off in the wild, where they belong. ... This makes it illegal to kill, injure, sell or trade wild slow-worms.

Are slow worms aggressive?

Slow worms are harmless to humans, but during courtship, male slow worms can exhibit some extremely aggressive behaviour, not only towards other male slow worms, but to females as well, and I suspect this is what you have witnessed here.