From Mortimer, the route follows a clear stream, then onward to the amphitheatre and the 2.5km of Roman walls surrounding the 107-acre site of the Roman town of Calleva with the twelfth-century church at its entrance. Recent clearance of foliage has improved the view of the amphitheatre and the wall.
The afternoon route is mainly through woods of Scots pine, and commons of gorse and birch trees. Aldermaston, the final destination, is reached over the River Kennet and the Kennet and Avon canal.
The walk will be at a moderate to brisk pace.
Train: Paddington 9.38 arr Reading 10.15 [GWR Didcot Parkway train] then change Reading 10.33 arr Mortimer 10.46 [Basingstoke Train]. Mortimer and Aldermaston are on different lines from Reading. If using GWR buy return to Mortimer and a single from Aldermaston to Reading.
Lunch: Picnic at Silchester Common. For drinks and toilet facilities only, there is a pub and a community cafe.
Toilet: Please use toilets on the train or at Reading Station, as there are no facilities until lunch stop.