Freighters turned back due Aircraft/Aircrew capability. Runway was available all morning.
( Re-edited a bit for brevity )
Well yes, that's sort of the point.
You can't crow about accepting City's fog diversions when Cat IIIA traffic heading to your airport has to divert. 'Hypocrisy' is the word that comes to mind.
Imagine if Easy were still operating 737s rather than IIIB A3xx... would Derry airport be crowing about accepting all those diversions? I think not.