I’ve never heard of this cancelled concert before. It would have been quite a night. From the Royal Albert Hall archives.

Main Performers
Dame Shirley Bassey,
Dame Cleo Laine,
Dame Kiri Te Kanawa - vocals
Performance Notes
An event which would have featured Dame Shirley Bassey, Dame Cleo Laine and Dame Kiri Te Kanawa performing together for the first time. The event was cancelled due to the ill health of Dame Shirley Bassey.




https://catalogue.royalalberthall.com/Record.aspx?src=CalmView.Performance&id=PERF10998&pos=63