The reserve consists of pastures grazed by horses around Mill Hill Electricity Substation. These contain patches of unimproved herb-rich pasture on damp clay soil. Locally uncommon plants include devil's bit scabious, sneezewort, pepper-saxifrage and red bartsia. The dividing hedges appear to be very old, and Burtonhole Brook, a tributary of Folly Brook, flows through the site, adding to its diversity of habitat. The hedgerows and woodland provide a refuge for birds.[1]
The reserve is on private land, but it can be viewed from Burtonhole Lane and Partingdale Lane.