Mission Impossible MK7 : O Whose Workpad!
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Difficulty:
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Terrain:
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Size: 
(not chosen)
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A mystery cache set somewhere in the environs of the City of Milton Keynes.
The clocks are changing next weekend so it’s high time for some more Mission Impossible MK challenges.
To determine the whereabouts of the cache you need to decode this section of Ciphertext :
2(12), 4(11), 2(5), 4(7)
3(14), 2(3), 9(6), 6(9), 2(7), 6(7), 2(9), 9(13), 1(3), 4(12), 3(9), 8(10), 8(11)
10(10), [ LII ], 9(11), 8(6), 8(8), 9(11), 9(7), 6(11), 6(6), 7(6)
6(2), 5(3), 8(8), 10(9), 9(11), [ XL ], 8(13), 6(10), 3(11), 9(11), 5(13), 2(12), 5(7)
The Ciphertext contains information about the cache AND the co-ordinates for the cache location.
You will know when you have correctly decoded it. However, the co-ordinates themselves will need further conversion before you can find the cache. To give you a start some of the numbers you need for the final cache location are embedded in the Ciphertext.
The key for the Ciphertext can only be found at a specific location in Milton Keynes. To determine this location there is also a puzzle to solve (hint : it is near the top of the cache page). To make sure you get safely to this specific location, I can tell you that the Seconds part of the Westings are 486.
As usual, some clues will be provided for my other caches in this series :
1 - Mission Impossible MK 6 : The Fishy Cache (GC1QXZM)
2 - Mission Impossible MK 8 : Secret Ingredients (GC22MY7)
Good Luck.
Additional Hints
(Decrypt)
Ybpngvba chmmyr : Arne gbc bs cntr
Pvcuregrkg chmmyr : "gubhfnaq" = 7(5)
Pb-beqvangr chmmyr : Gur pyhr jvyy or va sebag bs lbh naq vf fnvq gjvpr gb znxr fher lbh trg vg