Nickey Line is a fast and mostly flat old rail link between Hemel Hempstead and Harpenden
Made a few nav mistakes. First one was coming off the line too soon rather than staying left and going over the first main road - around 1km
Second was at the end when the path forks and you need to keep left.
Enjoyable run today as it was hot but the Nickey line is quite shaded.
Unsupported - nothing on route.