The Postbox number is made up of the letters CF followed by 4 digits. Assuming these digits are ABCD, the cache is hidden at the following coordinates:
N 51 28.(C-A) (B-1) (C-D) W 003 25.(C-B) (A+1) (B+D)
You are looking for a modified outer container about 6 inches tall containing a 35mm film pot.
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 email@example.com to have yours added
Top marks to Olddandare for getting there first and nabbing the FTF!