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
Beeswing ABCDE
Cradley FGHJK
North (A-D)(J-K) (C-D)(D+E).A(E-D)B West (A-C)(E-J)F (E/D)(A+G).DK(H-D)