GCHQ (British Intelligence) : Snowden files reveal spy agency's efforts to escape legal challenge (VIDEO)

British intelligence has been trying desperately to keep its surveillance practices secret - wary of public anger and legal challenges.

That's emerged from internal documents leaked by Edward Snowden, and obtained by the Guardian newspaper.

But as RT's Sara Firth reports, the spy agencies' worst fears are already coming true.

To discuss the controversial techniques used by British intelligence, and the ongoing backlash, former MI5 agent Annie Machon joins RT.