First part: break the code below.
LTRQO VBFSE RFJJQ PIUQJ MXRNB EBGLW SQLYQ PHYOJ HBEQL UWLHY WXHBI XCZUW SJYPB JGFMZ
To assist with this certain hints/parameters have been placed in other caches so if you find these then this particular puzzle may be easier.
Previous finders of these caches can ask for the hints via email if they like.
Up the Green - this gives a hint to a key.
There or here? (Mk 2) - this gives the value of a parameter.
Second part: A bit of excercise. Geocheck contains more info but you will need special equiepement (or to be very tall).
Well done to Urbandude23 for the first time find!