Just dropping in quickly to let you know that there's a new James Galway "how to" video showing his embouchure changing from low to high.
Link updated 2016:
The question from the Weggis flute student audience was:
How do you form the embouchure for the upper register?
The embouchure change is also shown in previous blog posts here.
Hope all my readers feel free to comment and give opinions and observations.
I've been mass practicing myself.
Hope to hear from you,