The published coordinates are for the parking area. Take a stroll around collecting clues to the cache location a short walk away at:
N53 15.(A)(B)(C) W002 22.(D)(E)(F)
Start by looking around the courtyard where you parked. The old school building from 1710 has an engraved stone above its front door. One line reads "Postea dotavit (A)45".
Pass through the lych gate into the churchyard, stopping to read the inscription carved along the beam under its roof. It starts: "Grant, O LORD, that through the grave and gate of death ..." and then has (B) more words.
Head for the church tower. A gravestone in the paving just outside the tower door reads: "Here Lyeth ye Body of Thos. Wood late of Plumley who dyed Novemr 21st 17(C)2. Aged 71 Years."
Look at the war memorial on the south wall of the tower. The main plaque lists the 1(D) local men who died (including one listed as "missing") in the 1914-1918 war.
Continue along this side of the church to the timber south porch. There are (E) thin wooden pillars connecting the porch wall to its roof on each of the two sides. (Don't count the thick wooden beam at the end, just the thin ones).
Return to the lych gate. Turn left down the path running east through the graveyard. Near its far end, just after a multi-trunked silver birch, is a very large stone cross. This is the grave of the poet "John Byrne Leicester Warren, 3rd and Last Baron Warren de Tabley" who was born in 183(F).
Your calculations should lead you through the nearby gate out of the churchyard and along a grassy (sometimes muddy) footpath.
At the cache location there is absolutely no need for any risk taking or acrobatics. The cache is an easy find while stood safely on solid ground.