I suspect you've stumbled across one of those wonderfully niche British pop-culture misunderstandings.
As far as I can find, Christine and the Queens (now often performing under the name Rahim Redcar) has never starred in a Dennis Norden musical. Dennis Norden was primarily a comedy writer and broadcaster, best known for It'll Be Alright on the Night, and there's no record of a musical by him featuring Christine and the Queens.
A couple of possibilities:
You may have heard "Christine and the Queens" and "Dennis Norden" in entirely different contexts and your brain filed them together.
You may be thinking of one of Christine's highly theatrical stage shows, which critics have compared to musicals, rock operas, and theatre pieces. Reviews have described performances as resembling a musical or rock opera rather than a conventional pop concert.
Or perhaps it was another British entertainment figure with a similar-sounding name (Norden/Norton, Christine/Christina, etc.).
Do you remember anything else about it? A TV show, a stage production, a joke on social media, or roughly when you heard it? One extra clue might be enough to track down the exact reference.