Paper 1 Drama and Poetry: Which edition of Who's Afraid of Virginia Woolf will be used to set examination questions?

In the 9695 syllabus, we've specified that we're setting questions and extracts on the Vintage edition of Who's Afraid of Virginia Woolf. We are also aware that the Berkley edition (2006) presents a revised version of the play. Candidates who have studied the Berkeley version will not be penalised. Candidates who are aware of the content of both editions may find it interesting to make reference to both in the exam if relevant to their discussion.