Nabucco in Holland Park

The performances of Verdi's Nabucco in Holland Park are very strange. See http://arts.independent.co.uk/music/reviews/article2640847.ece for hints about this.
Brad Cohen gets generally splendid results from the orchestra and on stage performers. I have not seen many performances of this opera, and this one is quite confusing. Personally I find it hard to know how to interpret Nabucco, and what Verdi was really trying to say. Dave2010