This is the site of the old Brentford Gasworks. Although the works was demolished years ago there are still some remenants of it remaining. To find this cache you need to be at the apex. Please return carefully so it is out of sight. This is a magnetic nano.
Note: August 2026. After repeated destructive muggling I have to conclude that someone is repeatedly targeting this cache. So I have switched it to a tiny magnetic Nano. Although there are four possible steel hosts please always replace on the one that is totally out of sight.