This is at an early stage of development and I'm still trying to resolve various puzzles and apparent contradications.
Many famous film and TV productions are associated with the place.
In the 1960s it was in use by ITC/ATV and ABC, producing shows such as The Prisoner and The Avengers. It's still used for James Bond movies.
Hammer Films are based at one of the sites. They used the now-gone Bray studios between 1951 and 1966.
Part of the studios was sold off to a property developer in the 1970s but then the local council found it had originally leased the land to the studio on the condition it be a film studio providing local employment. The council (Hertsmead?) and developer came to an agreement and part of the sold-off site reverted to the council, which now runs it as part of the studios.
The BBC used part of the studios for a while from the 1980s to at least the end of the 1990s; for instance for Top of The Pops and for drama productions such as Eastenders. Their long-time film critic Barry Norman occasionally reminiscesdabout it, taken there as a child by his father Leslie, who was an editor and later director at Elstree in the 1940s-1960s.
The Buggles 1980 album The Age of Plastic had a track called Elstree about the studio and that the BBC were now there.
The Raiders of the Lost Ark films used the studios.