The point about sharing playout in Birmingham in the 1950s and 60s is an interesting one.
Why could ATV and ABC do it there, but not Rediffusion and ATV in London or Granada and ABC in Manchester?
Was it down to the way those companies interacted with each other?
Was it that neither ATV (who were focused on the London franchise) or ABC (who were more focused on the North) regarded the Midlands as an area that was of secondary importance to them, so sharing facilities made more sense there?
Maybe. I suspect politics over ruled practicality with the other ITV 'sharer' companies.
Also don't forget ITN were on the 7th and 8th floor of Rediffusion's main base in Kingsway (Bang opposite the BBC's Bush House BTW)
I read somewhere, ATV had some office space in there too ?
The ground floor of the building today is a large Herman Miller (posh office chairs) showroom.
Didn't the Alpha studios building house BRMB from 1974 ?
Avatar credit: © BBC, ITA, BREMA 1967