Was a super injunction used in relation to the Southport murders or was it the Law that protects minors? I thought the latter but will gladly accept being proven wrong.

The idea of a super injunction is not one with which I disagree. There may be issues which shouldn't, initially, be reported on. Why? Matters of National Security for one, I'd go along with. Matters pertaining to Court cases which might prevent a fair trial is another.

What I would emphasise though is that they should, IMO, rarely be used and should need to be issued by a panel of High Court judges, not by a single judge/magistrate and never by a government of whatever flavour.