At the above co-ordinates you will need to find:
Details on the Post Box top telephone number : 03457 740A B C
The Postbox number: WR11 X Y ZD
The cache can be found at:
N 52 02. ( Y - B - X ) ( Z - A + X ) ( C + X )
W 002 00. ( B + C ) ( X + Y ) ( B + X - Y )
The Fine Pair series was originally started by wizardsmum but is now managed by mattd2k.
If anybody would like to place 'A Fine Pair' of their own please do. I would just ask that you first visit www.afinepair.co.uk to request a number to avoid any duplication.
mattd2k also keeps a public Bookmark List of this series. Once your cache is published please contact him via at email@example.com to have yours added.