Centenary House is owned by West Sussex County Council and is used by Social Services and as a Register Office. It is also the location of Worthing Durrington Police Station.
You do not need to go to the posted coordinates, the final cache is within 0.5 miles.
The coordinates for the final cache are:
N50 50.ABC W000 23.DEF
A = No of i's
B = No of b's
C = Join (2nd and 3rd) - 2
D = 1st word
E = 2nd word + 2
F = Third x 2
Checksum of all coordinates = 43
.