Re: Jury Nullification
Likely they took the view that the public and parliament had a right not to be lied to, and that "public interest" was not necessarily and only whatever the executive said it was. And possibly that it was for them, the jury, to decide guilt, not the judge.
Such acquittals are however sadly rare.
That's because (in both the USA and the UK) prosecutors, judges, and the gov't go to a lot of trouble to prevent people from being educated about their right to jury nullification. I think it should be a required part of the school curriculum.