I think it would have attracted a lot of attention, particularly on a slow news day. Two women a week are killed by male partners - not rare enough to make a big news story
. Heavily pregnant woman stabs adoring husband (flood hero) in front of 5yo son - much more unusual, so might well make the nationals, especially on a slow news day.
Many years ago, there was a violent crime committed in our neighbourhood. One child died and another was left permanently disabled. The perpetrator was their older brother, who was still a minor. It was unutterably awful. Anonymised coverage of both the initial offence and the trial did make the national press and the BBC. Fortunately, either the family were able to avail themselves of legal protection or the police withheld all details from the press or (just possibly) the press recognised that it would be beyond all decency to doorstep the family and their neighbours, so the coverage was restricted to just the facts, as far as I'm aware. However, in a case involving adults as victim and perp they are very rarely as restrained as that.
I thought of that old case when I read the discussion here immediately after the episode about whether Rob would press charges. As was pointed out by several people, it's not for Rob to decide. In criminal law, the prosecution comes from the crown and, regardless of how forgiving the victim is, if the CPS decides there is a case to answer, the prosecution will proceed. The family we knew were unbelievably strong in the face of the unimaginable tragedy that had torn them apart. They were quite certain from the start that the only possible explanation for what had happened was that their son was mentally ill. They forgave him and visited him regularly. If it had been up to them, there might not have been a trial. But (rightly, I think) it wasn't up to them and the CPS acted on behalf of the wider community to protect us all from this violent youth and to punish him for what he had done to his family. He was convicted of murder and attempted murder and I understand he is now in a secure mental health unit. Desperately sad.