 Best won a Laurence Olivier Award for playing the title role in "Hedda Gabler" and was nominated for the same award the following year for her performance as Josie in Eugene O'Neill's play "A Moon For The Misbegotten" at the Old Vic Theatre in London.In early 2007, she starred in a Sheffield Crucible production of "As You Like It" which played for a short time at the RSC's Swan Theatre in Stratford as part of their Complete Works season.In the same year she performed in the Broadway transfer of "A Moon For The Misbegotten" for which she was nominated for a Tony Award as Best Actress in a Play.