Mersea water tower - another one in the campanile style brick-tower-with-arches-and-pretend-windows series along with those at Bocking and Wivenhoe. This fine structure was built in 1925 to give the island mains water and was built from bricks made at the brickworks in Kingsland Road. The structure is currently unlisted but has been recommended for local listing.
The coordinates are for the tower where a few numbers (in bold below) need to be gathered to obtain the coordinates for the cache. Nothing too complicated or fancy so put your calculators away!
A
The large number on the nearby lampost
SV 100
6 B
In case of emergency contact
0800 91C7 354
In case of query contact
0845 D04 3000
Cache is located at
N51 46.AB2 E000 54.CD1
and is a simple micro. Good luck!