When changing jobs a few years back I took a 3 month moratorium. Later that year I was declined credit for a tv in Harvey Normans. Naturally that worried me so I paid the 6 euro to the Irish Credit Bureau to receive my credit history. What happened was that was that sometimes the M for Moratorium is construed as M for missed !
So, in short, taking a moratorium has no impact on your credit rating score unless someone misinterprets the report (I had this confirmed in writing to me by the ICB)