As a note to Baba Ga'on's post, I have seen that image before and believe it to be 'real'.
You know what made V for Vendetta so fantastic (as in not real)? That the population of Britain would stand up to their government. Individuals, sure, but a great segment of the populace in open defiance? If they accept a poster like that and all it means, then I simply don't think it's possible.
CR
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