Ashton, in Cornish Trevonnen, is a small village which dates from the 19th century and stands in the Parish of Breage
The name is believed to derive from the English rather than the Cornish language and to be associated with ash trees.
Nearby Tregonning Hill is excellent for walking and its summit makes a good viewpoint for Mounts Bay and the surrounding area. The hill is famous as the place where kaolin (china clay) was discovered by William Cookworthy circa 1745.
On the slope of Tregonning Hill was the site of an ancient settlement dating from c.6th century.
The Church itself is not exactly a memorable building, and appears to have no history whatsoever. I've driven past many times and hadn't even noticed it was there.
The co-ordinates listed are for the first question.
Question 1 - Standing in the lane opposite the garage is a telegraph pole with a street lamp at the top - there is a small silver number above the yellow "danger" sign - this is A
Question 2 - Just under the street lamp on the same pole are some numbers and letters - let the three numbers before the two letters be BCD
The cache can be found at N50 06.C(D/C)(D-A) W005 21.(D/C)75
Checksum for all digits = 41