Thanks all for your help and fast responses. I am going to take WRJ advice and use St James, it also makes sense with where they lived. I was surprised that FamilySearch dont list the specific churches either for Holywell as they do usually have the churches specified on the films/reference materials.
I also learned from you that the issue with mis-classification of parishes on the records on FindMy Past extends beyond Anglesey where it is one hot mess! and I thought Anglesey was the only county to have this problem. I am providing emails to the FindMyPast support team every time I come across an example and have been doing this for some weeks, still awaiting the corrections though, will chase them up once again today to see when we can expect the corrections.
Best Regards
Gill