The cache is not at the listed co-ords. It’s at: S 26 04.ABC and E 27 51.DEF
To find it you will have to go to the listed co-ords and find the letter with the eagle in it.
For A: Add 7
For B: Add 3
For C: Add 3
For D: Add 7
For E: Subtract 2
For F: Add 1
The cache itself is small and only has space for a logsheet.
As this type of cache seems to be a sought after muggle item, (we have lost quite a few in the past) we would appreciate it very much if a good eye could be kept out for them.