The NA, NA, NA, bit would be G, D, A, E, which would bring you to the B which would be the note that's played in the verse. The Hush, Hush, bit is B, E, A and that's the whole song. Hope this helps.
Just re-read your post and yes, they've gone from C to B.
As an aside, I came across this the other day. Brilliant!
http://www.youtube.com/watch?v=cIn5qNpfeQ0