Uneven Terrain is a series of short documentaries about urban exploration, about 10-15 minutes long each. There are six so far, about monumental ruins in New York, Centralia, the Pennsylvania town where an underground coalseam has been on fire since the 1960s, abandoned missile silos in the US and how they're being turned into homes, oil drilling in Los Angeles, the Teufelberg listening station and the abandoned bunkers under Tempelhof Airport in Berlin and pirate radio in London and on the old Redsand sea forts. Each short doc has a different presenter. All have accompanying photo galleries. [These are produced for the bootmaker Palladium, but it's pretty low-key]
The Maunsell Sea Forts: During the Second World War, three anti-aircraft forts were built in 1941-42 to protect the Thames Estuary, designed by Mr. G. A. Maunsell.