To find the co-ordinates, check the following:
The Post Box No = SLa bc
The number for the Phone Box = (01753) defghi
The final co-ordinates are N51 29.(a+g) (b-c) (d-e) W000 38.(i-g) (a+h) (b-f)
The Fine Pair series was originally started by wizardsmum.
If anybody would like to place 'A Fine Pair' of their own please do, I would just ask that you let mattd2k at geocachingafinepair@gmail.com know first so he can keep track of the numbers and names to avoid duplication.
He also keeps a public Bookmark List of this series so once your cache is published please contact him via his profile page to have yours added.