I used to run it and we used to get an average of 95 applications for the 24 available places. I think that says something for it! It may have changed, but you didn't used to get "nominated" for it, you had to apply, and there were many disappointed folk!
The guys and gals on the staff also work their butts off to make it a worthwhile, enjoyable and valuable course.
Do it as soon as you can get on it.