Wood Norton Hall was a country estate with extensive grounds and woodlands. Once the home of the Duke of Orleans, and later a private school, it was acquired by the BBC shortly before WWII for use as an emergency broadcasting centre.
Since the war, the site has been used as a training centre.
In the late 1960s or early 1970s, a new block of lecture theatres and training laboratories was built - on top of this substantial nuclear bunker, which was finished in 1967. The building is known as Bredon Wing.
For years, lecturers at the site have teased students about the bunker, claiming that it is anything from two to ten stories deep!
The bunker was (is?) a BBC emergency studio centre, designed to be capable of providing a radio broadcasting service in wartime. It is said to contain a number of radio studios and related facilities.
The bunker is built into the side of a hill. The photo shows the back of the building. At the front, the top of the bunker is at ground level.