Head South on the footpath across the field and then head SW beside the hedge, West on the crossfield path, through a gap in the hedge to a track leading to the road. Turn right and follow the road for 100m until you get to the Wildlife Trail on the left.
Go through the metal gate and take the bridleway across Greywell Moor (beware, sometimes there are bulls) to N 51° 15.248, W 0° 58.109. What year was E. C. Wallace born, 190A? A=
Head NW across the bridge over the Whitewater River to N 51° 15.257, W 0° 58.410. Take the footpath toward the church; see St Mary The Virgin for more information. How many clover leaf designs are on the Lych gates? B=
Head North through Greywell village, stopping at the Fox & Goose if you feel the need, to N 51° 15.461, W 0° 58.267. What length is the tunnel, 1CDE yards? C= , D= , E=
Following the discovery in 1985 of a colony of bats, the tunnel has been designated a Site of Special Scientific Interest (SSSI).
Head East along the tow path. You will come to a place where the canal crosses the Whitewater River; note that they are almost the same level. Continue to N 51° 15.686, W 0° 57.696. There is more information on Odiham Castle here. What is the final digit of the year that construction began on King John's Castle? F=
Now to the final coordinates, N 51° 15.UVW, W 0° 57.XYZ
Where U=A-D, V=F, W=C+D, X=CxD, Y=E, Z=A.
You are looking for a medium-sized tupperware box in a camo-bag. You may need to come at it from different directions to narrow the search down, as the trees cause erratic readings. There will be nettles in the summer!
Continue East along the canal to the start point.