You're right, Officer - apologies for my brain-fart. One of the less desirable effects of encroaching old age.

Adders not aggressive, and are very, very reluctant to bite. They are extremely shy and, unless disturbed unaware, they will move away from an intruder rather than attack. Their bite, in comparison with, for instance, some of the U.S. poisonous snakes, is mild - that's what I meant by harmless.

BTW, I live near, and have spent a very great deal of time in, two large forested areas which adders are known to inhabit. In fifty years, I've got close to only two or three, I left them alone and they simply moved away.