Major Project Unit- BBC: Writing TV Drama and the importance of storytelling

I recently found this webpage created by the BBC which discusses what makes a great TV drama.
http://www.bbc.co.uk/writersroom/writers-lab/genre-toolkits/writing-tv-drama
The website emphasises the importance of including scenes that aren't redundant, and making sure that dialogue compliments the story, and isn't used to tell it instead. This is something I have been told in the past, and the fact a major corporation like the BBC is reiterating this sentiment just suggests to me that this is something every screenwriter should know.
This concept is something I have been doing my best to incorporate into my own work recently. At a recent tutorial, with my script editor, we discussed the possibility of making Dreizer more of a silent antagonist in order to put more emphasis on his actions as opposed to his dialogue.
I will be experimenting with this idea, particularly in episode 6.