This one was originally in a tree but it kept getting muggled so I moved it. I have had to replace this cache so many times, I've hit "rock bottom" 
Here's hoping this time it stays put & muggle-free. I know some have concerns about the surveilence but this is public property, you are not infringing on anyone's privacy.
Base of the green painted retaining wall, closest to the road - use a small stick to scratch around underneath.
Container is a small, green tube.
Please replace exactly as found - make sure it is covered & out of sight.
Beware of muggles as this road & cycle / walking track are very busy.