If you are considering walking this route yourself, please see my disclaimer. You may also like to see these notes about the maps and GPX files.
I crossed this second street and continued straight on along another path, starting through a pub car park and passing left of the pub. It continued for a while between old hedgerows until it emerged in a field. It immediately turned right and shortly after turned left in a corner, continuing alongside a hedge. On reaching a path crossroads I turned left. This path ran along a grassy headland between fields. Further on it ran between a fence and a tall hedgerow on my right, rising gently uphill towards the right end of a row of large houses (one of which is Coleshill House according to the OS map).
The path from Coleshill
The path from Coleshill
The path from Coleshill
The path after I turned left, heading towards Coleshill House
The path heading towards Coleshill House
The path heading towards Coleshill House
The path ended at a bend in a road where I went straight on. When the road turned right, I took a footpath going half-left. This started downhill in a 'sunken lane' with hedges on each embankment. On reaching a field the gradient eased, and I just followed the path gently downhill for over half a mile, with a pleasant view ahead of me.
The road (near Coleshill House)
The path to Amersham Old Town
The path to Amersham Old Town
The path to Amersham Old Town
On reaching a paved path on the edge of Amersham, I turned left and went over a footbridge over the A413 main road. The path soon turned right and reached a path T-junction, where I went left. At the end of the path, I went a few yards left and turned right to follow a path downhill through an overgrown meadow (the actual public footpath here was impassable). On reaching a side street I turned left, and then turned left again at its end, into Whielden Street in Amersham Old Town. After one or two hundred yards I turned right along a footpath that started along a roughly surfaced street called The Platt.
Approaching the bridge over the A413 main road
Path near Amersham Old Town