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
Brockworth & Witcombe ABCDE
Hitchin FGHJ
North JB (A+E)C.G(D/A)B West B(E-F)F (H-J)(F-A),H(A+C)D