
You pre-Christmas task is to collect a sequence of twenty-four letters. Using a standard method, each letter can be replaced by a number.
The numbers are then used to calculate the coordinates of the cache. As a checksum, all the bonus numbers added together total 338. A worksheet is provided.

The final coordinates can be found using this calculation:

These caches have been placed by various Cunning Cachers across Berkshire, north Hampshire and south Oxfordshire.

Taking the twenty-four caches in sequence you will have a list of 24 letters.
Note: cache no.17 is currently unavailable. The bonus letter for no.17 is H.
Congratulations to team WendyKMJ for being the first to discover this cache and the others in the series not owned by WendyKMJ; and a big congratulations to the Danes Hunter for achieving all 25. Whether you find 24 or 25, you may display the Cunning Cachers' Christmas Advent medal on your profile page, details on the Geocheck solution page.