You will need the following information from 3 gravestones to enable you get the coordinates for the cache location.
The first digit of Harriet Aldersons age when she died? = (A)
Minus the year of birth of Thomas Henry Shackleton from the year of birth of his wife Annie, add 2 = (D)
William Smith Broomheads age when he died minus 10 = (C)
James Robertshaws age when he died minus 1 score and 10 = (B)
N53 43.(A B C) W001 51. 00(D)