According to David Zippel, lots of work was done, and a few new songs.
I already prefer the new lyrics to the title song, but overall, listening to the London Concept Album, I found it charming, tuneful, fun, touching, and easy to follow. Most of the initial reviews were in agreement....
Obviously it's not the greatest piece ever written, but it's a far cry stronger than some of its detractors state.
What did you feel needed work? I'm curious, as I never actually saw it. (The disadvantages of living up here in Calgary, Canada )