BBC inside GCHQ: Cracking the Code [2010] [audio]

I've listened to this several times over the years. It shows more of the human side of GCHQ, since the BBC could never broadcast operational specifics.

My favourite bits are: 17 minutes in, an interview with an active GCHQ cryptanalyst. She's actually remarkably forthcoming.

And ~20 minutes in, a tour of the massive warehouse of computers under GCHQ, which they promise us is definitely not being used to scoop up all our communications. Sure guys. Whatever you say.

Of course, it's all propaganda of the purest form, so take it with a fist full of salt.