The BAW38 clip, which included the surface movement radar recording, and can be seen now across the web came from an internal NATS source and, not surprisingly (and quite rightly) NATS made efforts to have it removed when it first appeared (iirc on wikileaks). The internet being what it is though, it had spread so widely so quickly it was an impossible task.

Whoever had official access to it and did the leaking though should be ashamed of themselves (imo).