The final for this Puzzle cache is a nano hidden in the woods 1.27Km/0.79 miles from the given co-ords, If that's not enough info to tie the location down for you, look around and head to N51° 49. 1105 less than a four digit number' W000° 35. 8% of a four digit number'. There may be more than one option for each set of numbers so use that 1.27Km or 0.79 miles (or the solution checker) to ensure you head to the right spot. Yes, this Puzzle is really a Multi in a party frock, but people seem to prefer Puzzles and there is scope for getting this quite badly wrong by putting the wrong numbers in the right places, or the right numbers in the wrong places, or the wrong numbers in the wrong places, so...
Set for the 2018 Winter Geolympix with permission from the National Trust. If you intend to attempt the unofficial Icon Challenge on Mega day you may want to leave this until then.