38 lest we forget Mystery Cache

2019 sees the centenary of the ending of WW1 and 75 years since D;Day during WW2. The series has been placed with this, in mind.

The difficulty rating is a mix of the puzzle and the final location.
At each final there is enough room for a single car to pull over to allow room for a car to pass, if you are sensible.
The only hint for the series is at No1 for the puzzle

Now for the puzzle

Croxton ABCDE

Faringdon FGHJK

North (B+D)(J-K) H(C-G).(J-G)J(C+E) West (A-F)(D-F)A FC.DJ(K+G)