To locate this cache: It's not hidden at the given co-ords. That would be too close to VoG2: The Tree of Wood, as well as far too easy! Treat this Letterbox cache as a multi.
Location 1: At the given co-ords you're looking for a plaque which tells you CW - a highly respected and gifted restorer - lived 19AB to 200C.
Location 2: (N51° 48.229 W000° 33.409) Number of letters in the name of the dog = D.
Final is at N51° 48. (D-A) (B+A) (A) W000° 33. (C-2) (C-B) (B-D) .
Please don't remove the stamp from the box; it's not a swap! Thank you, have fun and good luck!
(There should be a clear route to the final. If you seem to be heading somewhere private, you've done something wrong.)