This is a short, two part multi.
The cache container is not on the church grounds. The initial coordinates take you just inside the churchyard. Find the largest gravestone and use the details written on it to work out the following sums:
N51° 40.ABC W003° 57.DEF
David Williams was born May 18th GHIJ
He fell asleep January 29th KLMN
A=M+1
B=H-2
C=G
D=K+4
E=J+4
F=H
![The parish church of Llangyfelach, showing the prominent, but separate, church tower.](https://s3.amazonaws.com/gs-geo-images/b01153a5-ff29-47a8-a053-e105069dae79_l.jpg)
The Church of St. David & St. Cyfelach, Llangyfelach
The site dates back to the 6th Century.
St. David the Patron Saint of Wales founded an early Celtic monastery there.
The present church has a 12th-century detached tower and a converted tithe barn as the present church.
Contained within the church is the Llangyfelach Cross, a 9th Century Celtic stone.
The church attached to the tower was destroyed by a storm in 1803.
There have been 2 Church Micro caches at Llangyfelach church before:
Church Micro # 424 Saints David Llangyfelach (2009) by Matrix
Church Micro 1567... Llangyfelach (2011 - 2020) by Matrix (adopted by Duckers)
You can validate your puzzle solution with
certitude.
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Joint FTF by welshman65 and cloudspotter