Apparently Diana might not be singing in the show tomorrow:
https://www.digitalspy.com/tv/reality-tv/a134973/diana-to-skip-x-factor-show/
This really doesn't seem right to me (not least cos I can't stand her - Simon was right when he said she is the singing equivalent of marmite).
Thinking back, Rik Waller had to drop out of the first series of Pop Idol as he had a throat infection and couldn't sing - Darius took his place. Why should it be any different for Diana, if it is true.