L1 Pockett's Wharf Mystery Cache

Dating from 1992 the development you're looking at is named after the wharf on which it is sited - Pockett's Wharf.

For GZ co-ordinates, you'll need to answer 4 questions below for the co-ordinates.

A = 4 , B = 2, C = 3, D = 6,
E = 8, F = 6, G = 1 , H = 9,
I  = 0, J  = 2, K = 6, L = 2,
M = 4, N = 5, O = 1, P = 3,
Q = 2, R = 4, S = 5, T = 4, 
U = 8, V = 9, W = 2, X = 6,
Y = 5, Z = 2,
 

FOUR QUESTIONS - SUBSTITUTE INTO THE CO-ORDINATES BELOW

Z = Refer to: Pockett's Wharf History, find James and Henry Pocketts' brother's year of death and substitue the question mark:  xx?x
Y = Look at the nautical flags on the right of the tablet. Second from top. Look up the letter this signifies in the code above.
X = Look at the panel of hieroglyphics on the bottom of the tablet. Translate the hieroglyphics to find a name. The first letter of that name as it is normally written in English is the letter you'll need to look up in the code to return the answer.
​V = Referring again to the Pockett's Wharf History article, what year was the paddle steamer, 'Velindra' (pictured above) added to the Pocketts' fleet? xx(?+1)x

N 51° XV.0YY W 00X° YY.ZZZ