This is Ide Hill. Letterbox Hybrid
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Difficulty:
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Terrain:
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Size: 
(micro)
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At the Given Co-ords you will find a Concrete Hydrant post with a H on it and 2 numbers
Add these 2 numbers together to give you one 3 figure number = ? ? ?
Now to find the cache you need to go to the centre of the roundabout :-
1. minus 13 from the ? ? ? number = How far away the cache is, in meters.
2. minus 36 from the ? ? ? number = In degrees, which way you need to go.
Good luck and thanks to C11 for the idea for this cache.
Additional Hints
(Decrypt)
Ybj qbja ba gur yrsg unaq fvqr naq vgf zntargvp gbb whfg znxr fher lbh cvpx gur evtug gvzr nf zhttyrf pna nccrne sebz ab jurer.