The above co-ordinates are TOTALLY IRRELEVANT to this cache and were in fact the co-ordinates for "Chesters Oxford Parks Quest - South Park" GC122FK.
In order to locate this cache which is set in a fantastic place, you need to find 4 TRAVEL BUGS which are to remain anywhere in OXFORDSHIRE, they are:
STAN
KYLE
KENNY
CARTMAN
All four have a number on their backs which when put into this equation will lead you to a MICRO.
N51' (2STAN)+(KYLE).(2KYLE)(CARTMAN)(KENNY-KYLE)
W001' (STAN).(CARTMAN-KYLE)(KENNY+1)(CARTMAN+KYLE)
Hopefully this makes sense! Inside the MICRO are the co-ordinates for the main cache. You can walk to the final, but bring some time! It really is as simple as that. Depending on where the TBs go this cache could fluctuate between a 1,1 and a 5,5! Hence the ratings. I would appreciate any feedback on this cache as it's the most complicated one I've set so far! Enjoy and Good Luck!!
Edit 26.9.18: It seems the micro has disappeared. Please email me before attempting this cache with the micro coordinates and I will give you the coords + hint for the final.