Paddock is the codename of a bunker that was built in the late 1930s as a back-up for the better known Cabinet War Rooms located in Whitehall.
Junction box in the upper basement floor of the Paddock bunker; CWR-AWR almost certainly stands for 'Cabinet War Room - Air Raid Warning'
The bunker was abandoned at the end of the war, and was only used intermittently after that by the Post Office, whose Research Station sat atop it. In 1998, the surface site and the bunker were sold off, and a housing development was built on top. Unfortunately, during the development, the concrete slab that kept the bunker watertight was damaged, and since then, Paddock has been slowly decaying.