OneOneTwo,
your comments about the state of the ARs in Drogheda reminds me that when I was there, in Sept 1967, some of the ARs had been freshly repainted in GREEN! (As also happened with AA1 & 3 in Waterford). Would you have any record/photos of these? I would be interested to know which were green.
In relation to ARs in Cork, I have never heard of this before. Are you sure it was ARs? Do you have any idea which and when? I know many buses went to Cork at various stages late in their lives (e.g. R4, 19 and 37; also some Boltons), but I wonder about ARs.