I think it is necessarily case by case. I think proportionality is important. I do think that the integrity of the journalism matters sometimes because in some cases the ends are bound to be sometimes speculative. That is to say you get legal cases where there is challenge over one method or another, and the news media concerned has said, "What we thought we were going to find was this, but actually something interrupted us", an injunction or whatever it was. There I think the integrity of the editorial process is an important piece of the publication's defence. But as to setting a line about there are some things that are completely unacceptable in all circumstances -- I think that would be difficult to do other than saying that -- agreeing with David Leigh that murdering somebody wouldn't be justified.