Denham, UK. 6 February, 2020. An environmental activist observes engineers working on behalf of HS2 as they construct a security fence at Denham Ford. Works planned for the HS2 high-speed rail link in the immediate vicinity include the construction of a Bailey bridge across the ford and a compound in Denham Country Park requiring the felling of mature trees. Some of the site lies within a wetland nature reserve forming part of a Site of Metropolitan Importance for Nature Conservation (SMI).