 Helen Mirren (qv) says transforming herself into the Queen came  almost naturally after the wig and glasses, especially since she  shares a default facial expression, a slightly down turned mouth,  with the monarch. She also regularly reviewed film and video footage  of Elizabeth and kept photographs in her trailer during production.  The writer Peter Morgan (I) (qv) says it was convincing enough  that, by the end of production, crew members who had been accustomed  to slouching or relaxing when they addressed her were standing  straight up and respectfully folding their hands behind their backs.