Habitat destruction is the main reason that sand lizards are so rare today. Large areas of heathland were destroyed in the early 20th Century to make way either for agriculture or housing developments. Heath fires are a danger for surviving populations.
The sand lizard, in common with other lizards, has a clever trick up its sleeve if it is caught by a predator. It can detach its tail! This is particularly useful if caught by a bird, as it can allow the lizard to escape. You can occasionally spot a 'stumpy' lizard that has used its escape trick. The tail will regrow eventually, but can't be detached a second time.