2016 marks the 400th year anniversary of the death of William Shakespeare. And whether you believe that the man from Stratford Upon Avon wrote the plays, or that someone else was responsible, it is true to say that an extraordinary body of work was left, with Macbeth being amongst the greatest plays. Last night a new version opened at the Birmingham Rep, one that brought the horror, intrigue and violence of ‘The Scottish Play’ kicking and screaming into the 21st century.   The ancient castles of Scotland have been replaced with a claustrophobic set that resembles a wartime bunker for much of the time, and Guantanamo Bay at others. War…