The whole musical was wonderfully rendered, I was more surprised than delighted when watching it on Taiwan PTS.
Rachel York is definitely the star of the show, her impeccable layers of tone colours and surprising (again!) varieties of skills ranging from a possible Mozart's Queen of the Night, a Puccini's Mimi, Strauss' Rosalinde, to a Wagnerian Tristan, as very well mentioned in the previous IMDb member's comment.
York is a true actor and a fine musician.
Barrett somehow reminded me of the young Baryshnikov in the ballet version, both were dashing and fun. Baryshnikov was creative and bold enough to break into the theatre from one of the side exits at the audience when he performed in Taipei some 10 years ago, his entrance impressed me profoundly ever since. Barrett made a similar impact on TV, I would be glad to imagine how those lucky people in London felt at that moment. Barrett drew your attention all the time when he sang, acted, or spoke.
If York stole the show, her fellow actors played her guardian angels.
BRAVO!