Look Up Once More - CDG puzzle circuit Mystery Cache

This cache is inspired by the “Look” caches recently published by Geocotch. The series having been initiated by Footsore and Weary and expanded by Tjapukai, Ian Too and the Purple Pineapples......

The cache is on a spur from the puzzle circuit collectively created by Geocotch, Dondesole and myself.

Needless to say the cache is not at the published coordinates which are for a point on a circular walk from Cobham. It is within a mile or so of these coordinates. As an experienced geocacher and puzzle cache solver you should be able to convert each of the dates below into a 3 digit number.

Use the resulting 3 digit numbers in the formula below to calculate the cache coordinates. If the formula states A1, then you need to use the first digit of the three digit number, A2 refers to the second digit and A3 refers to the final digit.

N51 A1 B1.B2 C3 E2

E000 D1 (E1+F1).B3 (D2-D1) E3

When you get to GZ you will be able to see the cache, but can you retrieve it? Please don't take any risks