Hi,   Apologies, as I have now found that  there are christenings from 1783  at National Library of Wales and Haverfordwest Records, in respect of Little Newcastle. Also burials 1783 - 1813 and Marriages 1813 - 1966. There are a few Bishops Transcripts records at National Library of Wales but I do not think they are the years you are looking for.   Yvonne Evans