When I did it, (i was edexcel, and got an A) everything pretty much fit into the formula of:
A - Take a concept relevant to the play, e.g. futility
B - Take an aspect of theatre, e.g. movement, voice, staging, rehearsal technique
C - Take a pretentious idea about how B would show A, e.g. "I would use thrust staging so that the audience surrounded the action on stage, creating a more intimate atmosphere. By doing this, and having the audience more involved, they are likely to emotionally connect with the subject matter, taking them through the process of catharsis, increasing their empathy with the characters, and therefore a frustration at the concept of the futility of war"
It really is that pretentious.