The road here was known as Vinegar Hill, because it is has a sharp bend.

Carry on pass the entrance to Drop Lane and Riverside Way.

Then take the path on your right between two fields and follow this path to the Radlett Road .
There is a house on your left called Frogmore Lodge and a new barn conversion to your right.

Frogmore Lodge was the gate house to the original Frogmore House. Frogmore housed many famous people, but Lady Yule had it knocked down, because she did not want anyone in the area to have a house as grand as hers. Instead she bred cattle there. The grounds of old Frogmore has been subject of a conversion and it is a stable yard and is now known as Winslo House and Winslo Stables.
At Radlett Road go right and immediately left up through the industrial estate.
On the 1st left bend cross the road and up over the bridge.
Keep heading along down this path pass some fishing lakes and a new house and paddocks.
You will then go beside the river under the M25. and enter some farm land. Here you keep close to the hedge line.
You can have a short canter along here to where the field meets the road.
Here you have a choice; you can ride around the field edge to your left and have a canter for about 500m, but at the end you have to turn around and ride back or you can continue to London Colney and then back track to Smug Oak Stables.