I am a bit surprised by this, but Sam has advised me that the Crambus pratella that I recorded at Ochrwyth last June was in fact a County first. Couple of points then - the maps in the Micro Moths field guide for Monmouthshire don't necessarily correspond to the county list and also, not all records in the Lep. of Monmouthshire continue to hold true.
The photograph below is of one of two individuals recorded at Ochrwyth quarry on 29 June 2013 - sorry about the poor quality. I also recorded the species in my garden at Ochrwyth on 26 June.