The Common Lizard, is a very useful indicator species of the health of habitats.
There are six native species of reptile in the UK and all receive protection under UK law. Smooth snakes and sand lizards have a highly restricted distribution in the UK and receive full and stringent protection under The Conservation of Habitats and Species Regulations 2010 and the Wildlife and Countryside Act (1981) (as amended).
Slow worms, common lizards, adders and grass snakes are common in the UK and receive partial legal protection under Schedule 5 of the Wildlife and Countryside Act: it is illegal to intentionally kill, injure, trade or sell these species.
You can find more information about UK reptiles and amphibians here