At the end of the commentary, it is a very good idea to look at what happened *after* the period mentioned in the passage. Did this debate ("elitism versus populaism") continue to affect British television in later decades? How? Can you give some examples?
Notes on style
1) Do not use contractions in university work.
2) In this kind of essay, one sentence is not enough to make a paragraph. A new paragraph for every sentence is a style used in informal journalism, but is not appropriate here.
3) Do not begin "the document we have to comment on" (cela signifie à peu près "le document qu'on nous oblige à commenter".
We conclude that dissatisfaction with television can be largely ascribed to the independent television service.'
-The Pilkington Report.