Not a bad list, Ruth!
Now, desperately trying to root out something impressive....
As a choir member I have stood
behind Ian Bostridge, Anthony Rolfe Johnson, Lynne Dawson, Barbara Bonney, Michael Chance, lots of others...not really very impressive because most choir singers have done the same; and
in front of Charles Groves, Richard Hickox, Roy Goodman, Libor Pesek, Yuri Timerkanov, and others I didn't notice
. Timerkanov was the most frightening.
(Also one or two I would only want to whisper about - Carl Davis, Sarah Brightman, Michael Ball.)