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
Breamore ABCDE
Collingbourne Kingston FGHJK
North J(D-E) (K-A)(D+B).(E+B)(K-F)A West (D-E)(A-F)C GH.KCA