Mills on the Wye - Ash Mill to West Wycombe Mill (Adventure Lab - Bonus)
Cache is not at the posted coordinates. You'll need to complete the accompanying Adventure Labs to work out where it is. The Adventure Labs will take to the (mostly former) locations of five of the estimated 30-40 water mills that once sat alongside the short (but very well used) 10-mile length of the River Wye. This bonus can be found closest to the West Wycombe Mill stage of the aforementioned Adventure Labs.

After visiting each location and answering the questions you will be given values for A-E which you need to work out the location of the bonus.
- The bonus is located at: N 51° 38.ABC' W 000° 47.DE3
Congratulations to Team Hippo for the FTF!