I think there are two separate outstanding issues.
The Darlington NHS issue is that Rose raised a grievance about the nurses who signed the letter of complaint about him, and that grievance was put on hold pending the outcome of the tribunal. The employer must complete that grievance investigation process (but they shouldn't have dragged their feet once the tribunal decision was published).
The NMC complaints were made not by NHS body, but by members of the public following the 4 nurses TV appearance. I think at least one tabloid described it as an investigation into 26 nurses, but it's not, Christian Concern have confirmed it is just the 4 who were on TV.Again, NMC must complete at least the preliminary investigation, but really shouldn't be taking this long.