Not disputing that there is some 'voluntary' suppression of facts by the media but a quick search of BBC news shows 5 stories in the last 10 days.
http://www.bbc.co.uk/search/news/?q=GCHQ
In the UK, we aren't having any real public debate about the security services, largely because the homegrown news organisations aren't giving the issues the attention they deserve. I don't know what would happen to them if they took a stand against a D-Notice.
(BTW, the 2nd result on that BBC news search is more like a job ad for GCHQ)
(Edited to remove my erroneous claim that D-notices aren't voluntary, turns out they are, though hardly any media orgs. go against them)
