From Letty Green station on the Cole Green Way the walk goes West to the A414, then into Letty Green along Deadfield Lane, then on to Piper's End and East End Green, then South East for a bit before turning North East to meet the Cole Green Way again near Hertingfordbury; back along the Cole Green Way to the car park, where the Cowper Arms is next door. Good paths and quiet roads along the whole route.
The walk leader is Penny 07918 658830.
ACKNOWLEDGEMENTS: the walk is no. 149 from the excellent Hertfordshire Walker collection, and the track shown in the photo is their track uploaded to Google Earth. The other photo is Deadfield Lane, taken on the recce in late November.