I missed this series when I was younger and I am glad I found it on YouTube. The quality was not very good in the that respect but it was watchable.
It concerns staff working in a 'smart building' where everything, elevators, temp,air con and fire doors and more are controlled by computer. The two executives who are the focus of the tale have made decisions on job losses based on data from the system.
Unfortunately it has been hacked by a disgruntled employee who is on the redundancy list and there are held captive in their office until they change their minds. Ironic as they are laying off a man a lot smarter that them, as he has completely doctored communication lines etc so that cannot anyone know of there plight. The beginning and end scenes of staff who frank their own uslesness, if you like, give us a nice intro and outdo to the story.
The acting was usual top notch cast of British television regulars and directed by a man who who had succes later in life with several sitcoms (different!).
It is quite forward thinking in the way that even then the human race was starting to promote the reliance on technology and I am sure that people laughed at this. Arthur C, Clarke said something about magic in history is tomorrow's reality. It does have a general message that technology is only as productive as the people that feed it and we cannot afford to remove too much of the human element in our daily tasks. It may be end for us all if we make technology too good.