WW2 Anti Aircraft base

In the second world war London was defended from the german Luftwaffe bombers by a line of anti aircraft gun emplacements.
This abandoned site held the largest number of guns in the area and was positioned in such a way that you could see all the way to London.
That is impossible now to the immediate vicinity having masses of earth piled up around to hide the base and a large black of flats being built since the war.
Luckily the gate was open when I visited so I was able to have a wander around and take some snaps