The listed coords are for the village sign which is quite hard to miss as is belended in.

in front and to the left of the sign is a green box with two numbers on it as stickers. The numbers are both the same.
A = That number
B = The two numbers added together
C = A+B
Cache can be found at:
N51 08. (BxC) (CxC) (A+A+B)
E000 05. (A+B+C) (B+C) (C-B-A)
About Village Sign Caches
This cache belongs to the Village Sign Series, a series of caches based on ornate signs that depict the heritage, history and culture of the villages that put them up (generally on the village green!).
The signs can be made of different materials from fibreglass to wood, from forged steel to stone. They can depict anything from local industry to historical events. The tradition probably started in Norfolk or Suffolk and has now spread across most of the country so we thought we would base a series on them!
More information and statistics can be found at the Village Signs Website - https://www.villagesignseries.co.uk
The cache container is a magnetic 35ml film pot.