of related interest to what has been covered over the past couple of weeks is Charlie Brooker's 'Newswipe' that was first screened on BBC 4 and which you may have already seen. It is now accessible from YouTube. Basically it investigates how news is constructed, how it is told, why this may be so, and the implications of this upon the public.
If anything, it may give you a springboard for the assignment.
Regards - James.