I was reading a book by Shaun Sutton, who was BBC TV's head of drama in the 70s. He said that by far the biggest cost to come out of a programme's budget was manpower, for staff such as make-up artists, costume designers, set designers etc.
Does this mean that, for example, the Costume Department would charge a programme's producer, according to how many hours' work had gone into each programme, and out of the total money from all the programmes they had worked on would come the Costume staff's salaries?
Also, if this is correct, what would have happened in a month where the total costume requirements of all the programmes combined hadn't been enough to generate the total salaries of the costume staff's salaries? Would the Costume Department have had to get the money directly from the television budget, or perhaps have its own budget for such an occurence? This is just theoretical, as I don't know if such a situation would have occured.
Please bear in mind that I'm talking about the time when everything was done in-house, not after the BBC started contracting out much of its work.
Also, it may seem a strange question to ask, but I'm very interested in how the BBC worked, so any information on this would be much appreciated. Many thanks.