On a more than usually chaotic press night, the great woman was there herself, a tiny titan surrounded by her vast entourage, arriving late. Their treatment also has the effect of undermining one of the most interesting and dynamic qualities about Khan herself – her musical curiosity and her willingness to experiment. There are, in fact, suggestions that there might be a better musical labouring under all the layers of muddle. Those addiction issues, though central to a narrative that begins in a family therapy session in rehab, are never properly explored. Perhaps it is the involvement of the legend herself that restricts the show’s ability to peer beneath the surface.