Length — 54km (walked 2018)

This section makes its way across country to Watford, then to Oxhey Woods and Batchworth Heath, before dropping to the Colne Valley at Batchworth (1.5km by road to Rickmansworth station).
| 12: Potters Bar to Redwell Wood — 6.69km; 99m ascent Mainly tracks, with some linking roads | Map Directions |
| 13: Redwell Wood to London Colney — 7.78km; 18m ascent Field paths and tracks predominate | Map Directions |
| 14: London Colney to Radlett — 10.49km; 86m ascent Roads around Shenleybury and in Radlett, otherwise tracks and paths. | Map Directions |
| 15: Radlett to Watford — 10.38km; 76m ascent Paths and tracks, with a largely traffic-free route through Watford. | Map Directions |
| 16: Watford to Northwood — 12.07km; 187m ascent A patchwork of roads and paths: Oxhey Woods a highlight | Map Directions |
| 17: Northwood to Batchworth — 6.51km; 81m ascent Almost all on paths | Map Directions |
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