The Rookery Multi-Cache
Unobtainium: I couldn't find the container either so it's time to retire this cache as it's not one of my best.
Unobtainium
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Difficulty:
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Terrain:
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Size: 
(micro)
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The cache is located in a public area know locally as 'The
Rookery'.
You are looking for a black 35mm film container which is located at
the end of a short walk.
The coordinates given are for the first stage. At this point you'll
find DP ????. These four numbers relate to A,B,C and D
respectively.
At N51 28.731 E000 20.671 you'll find BT ?M ?? ?I. These four
numbers relate to E,F,G and H respectively.
At N51 28.768 E000 20.695 you'll need to find two numbers to
un'lock' the final location. I and J are followed by 0EUX.
The final location is at N51 QR.STU' E000 VW.XYZ' where: Q= A+1 ;
R= B+5 S= C ; T= D+5 U= E-8 V= F+2 ; W= G-3 X= H+5 ; Y= I+2 Z= J+1
Additional Hints
(Decrypt)
Va gur pbeare haqre gur obggbz one.