Is there another GCHQ challenge?
blog.jgc.org
blog.jgc.org
This would seem to imply that the people at the sharp end of my country's cyber defence are fairly junior (because it's trivially easy to earn more than £25k in the UK if you have even moderate skills).
I believe these things are more difficult for graduates wanting to start in a private company for or in the same field.
However, from what I understand GCHQ offers fairly competitive salaries and benefits for the people who they want, but these are essentially entry "graduate" roles that are being advertised, and £25k is pretty good for a graduate in the current economy.
http://www.civilservant.org.uk/pay.shtml
For fun, here's the GS calculator for the U.S.
http://www.fedsmith.com/pay_rates/
A GS-13 step 7 in SF makes $116240.
But a more entry-level GS-7 step 1 in D.C. makes $42209