Set for the 2018 Winter Geolympix FTFrenzy with permission from the National Trust.
To locate this Puzzle-style Letterbox/Hybrid cache - which is not hidden at the given co-ords and there's no need to visit them - simply pick a spot towards the bottom-left corner and go north for 400m, then SE for 565m, then north for 400m before backtracking south for a quarter mile. Turn left and walk forward for 300m before performing a gentle 180 degree turn to the left with a radius of 100m and then proceeding west for 200m. At this point, turn north and head that way for 200m, and then turn east and walk 400m. Now turn 90 degree right and walk a further 400m before performing a sharp left turn and walking an additional 300m. Now perform a 90 degree left turn, proceed for a quarter mile and then turn sharp left to walk 283m SouthWest. From this point head 500m due east and then make a full 360 degree turn to the left with a radius of `100m. This will return you to where you were, still facing east. Now make another 628.3m circuit by turning to the right and maintaining a 100m radius. Once again you're at this waypoint, facing east.
After a rest, carry on east, jumping after 150m and continuing for a further 350m. Now backtrack 100m, turn north, proceed for another 200m before making a sharp turn SouthWest and going 283m. Then turn east again and continue in that way for 200m. Yes, I know you're in familiar territory. Trust me! At a familiar turning, go south rather than north and continue that way for an eighth of a mile. Then turn 90 degrees left, head east for 200m and then make a 180 degree turn to the left, with a radius of 100m. Once at the end of that, turn east on the spot and do it all again. You should end up 400m due north of where you started this maneuver. That confirmed, turn 180 degrees again and continue to the east for 300m before making a 100m radius turn to the right. Walk 314.16m until you're facing due west. Now turn to your left but make a full circuit of the same diameter until you're back at the same spot before turning right and performing another 100m radius turn until you're facing due east again. Simple!
For your third leg, walk east for 200m, turn 90 degrees right, walk 400m, turn to face NE, go 141.4m then make a 90 degree turn to the right and proceed a further 141.4m before turning sharply to your left and going 400m due north. From here, turn east, go 300m and turn to your right to make a full circular turn with a radius of 200m. Once you're back to where you were, go 500m east and do the same procedure. Once completed go another 500m east and - yes! - do it all again. Now go 300m east, turn 180 degrees right (100m radius) until you're facing west again. Turn on the spot and now facing east, do it again. Once you're facing west again, turn 180 degrees on the spot and continue east for 400m. Now turn 180 degrees to the left, keeping a radius of 100m until you're facing west once again. Head that way for 200m before turning right and heading north for 200m. At this point turn 90 degrees right and continue east for a full 700m - making a jump at 350m, approx. At the end you'll need to turn very sharply to your right and heading vaguely SW/WSW for 500m. Then turn sharp left and go east for a quarter mile. Now head between NE and NNE for 500m until you turn sharp left again to face due west. Nearly done!
For this final stage you'll want to go due west for 300m before turning on the spot and retracing your path. Go 300m beyond where you turned before (a total of 600m) and then turn right to face south. Head that way for 400m before making a 180 degree turn, backtracking 200m, turning west, proceeding 200m, turning to face NE and going that way for 283m. You'll land at a familiar spot. Now go 200m south and turn left. After another 200m heading east you should have the final co-ords, if you've been paying attention. Good luck!
Note the values for U and V in this cache/s final co-ords to help you find FTFrenzy cache 10 for a Bird You Must Not Miss! - Please DO NOT remove the stamp or ink pad. Neither is a swap - They make this cache a LetterBox/Hybrid. Thank you!