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While the music and staging were very modern the story was typical opera material: girl gets consumed by demons (of some sort); well-meaning but misguided people try to help her; she dies. Dramatic stuff made more dramatic by the tense score and singing that ranged widely in both pitch and volume.
And to add icing to the cake we actually had a hot sunny day in which to enjoy the exploring gardens while sipping a glass of Pimms. This is what summers are for.