From the Guardian:
The Guardian is prevented from identifying the [member of Parliament] who has asked the question, what the question is, which minister might answer it, or where the question is to be found.
The Guardian is also forbidden from telling its readers why the paper is prevented – for the first time in memory – from reporting parliament. Legal obstacles, which cannot be identified, involve proceedings, which cannot be mentioned, on behalf of a client who must remain secret.
That sounds like a gag order well worth breaking.