Dude,
Ok so I am Navy but I have just had a Career Break accepted. I am off to do the ATPL exams plus CPL and Flying Instructor Rating.
As you have no doubt realised taking a career break is ideal as you get to go for a change in career but still have a plan B if it all goes wrong (2008 is also looking rather turbulent economically).
The process is very simple. PM me with your e-mail and I can send you all my bumf including a copy of my letter (written with all consideration given to Defence Writing, having done the joy of staff course).
In the Navy at the moment most applications are being accepted with the view that they are a good retention measure.
Cheers
MFWF
P.S I note your location as Lytham! My home town.