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
Wimbledon ABCDE
Holyport FGHJ
North (C+A)(C-D) (D+A)(B*C).(H+D)BA West (D-C)(C-D)E (C-H)G.(A-H)HA