|Location Map ( geo)|
|To:||Chilton Foliat (SU321704)|
|Distance:||14.8 miles (23.8 km)|
|Meets:||A417, B4507, B4000, B4192|
|Old route now:||B4507, B4000|
|Route outline (key)|
The B4001 is a rural B-road, mostly in Berkshire.
Originally the B4001 started on the A417 to the east of Wantage. However, this first section was quickly renumbered B4507 and the northern end of the B4001 moved to Petwick, although it still started on the same A-road. The road begins by heading south.
The first village it reaches is Childrey, south of which it crosses the B4507 (thus rejoining its original route), then it climbs Hackpen Hill and reaches a summit as it crosses the Ridgeway. It then descends across Lambourn Downs to Lambourn itself.
In the centre of the village it crosses the River Lambourn then reaches a crossroads by the church. The B4000 comes in from the right (although owing to narrow roads that is not signposted this way) then TOTSOs to become the dominant partner in a multiplex with the B4001. In fact, this multiplex is only recent as the two roads used to cross here.
After Lambourn Woodlands the B4001 turns right to regain its number and southerly direction. It then crosses under the M4 and passes into Wiltshire. A short distance later it reaches Chilton Foliat on the bank of the River Kennett where its terminus is on the B4192 (former A419).