I had the impression that the site is now out of use. The gate was wide open but there didn't seem to be anyone around. Compare with this view from 2009 http://www.geograph.org.uk/photo/1595043 - the microwave aerial on the mast has been removed, for example.
Uploaded to Geograph by Alan Murray-Rust on 11 April 2016
Photo © Alan Murray-Rust, 11 April 2016. Licensed for reuse under this Creative Commons licence