The papers should have left CF alone totally, for the simple reason that it can prevent the chance of a fair trial.
I think this is something the judge would have had to decide on. Particularly with jury selection. If it was a jury trial that is and not simply one with a judge, which can be done in the crown court. The judge could have decided that due to jury bias it would be a bench trial only with no jury if both sides were amenable. To ensure a fair trial and no jury bias.
I think the main issues from what I can glean is Caroline confessed to it in her police statement, and her partner also gave a statement saying she had done it, this coupled with his injuries, the scene, 999 call etc, is all a bit overwhelming evidence.
Once he gave his statement, he is then a witness and has to appear in court when summoned, failure to do so would result in his arrest. The fact he changed his mind and no longer wished to is not relevant. He would need to appear for questioning.
Domestic violence laws have been tightened up over the last couple of years, only ten percent of cases were prosecuted, and rhe public demanded an improvement, to take if more seriously and rhe laws and processes were changed to reflect that. So they can't really change that back because of a high profile case. Tightening it up was the right thing to do.
The elements of fit to stand trial, or jury trial v bench trial are seperate issues, that would need to be dealt with.
All in though, it's irrelevant for this case now sadly, but important understanding for others, to know that a victim does not need to be in favour of pressing charges for it to go ahead.