After inclosure of the parish in 1778, Arthur Young, despite never having visited the village, described Bolnhurst as:
a wet heavy bad country very disadvantageously circumstanced respecting roads, for every way around they are almost impassable... after inclosing fell into bad hands, they laid much of it down to grass in as bad order as possible, and it has continued so ever since in as rough and ill conditioned and unprofitable a state as can be well conceived... It should seem that corn has there been lessened without making amends for the loss by ample products of new grass.[4]
On 1 April 1934 the parish was abolished to form "Bolnhurst and Keysoe".[5]
The Church of England parish church of St Dunstan is about 2⁄5 mile (1 km) southwest of the current village. The earliest part of the present building is the 13th-century chancel. The chancel arch and three of the nave windows are 14th-century, including a three-light Decorated Gothic traceried one on the south side. But most of the nave is now Perpendicular Gothic, including two transomed and traceried windows on the north side.[6]
Inside the nave over the north door is the remains of a large medieval wall painting of St Christopher. In the northeast corner of the nave are monuments to two members of the Francklin family: John (died 1707) and Dame Dorothy (died 1727).[7]
The tower has a ring of four bells. John Dier of Hitchin, Hertfordshire cast the second and third bells in 1587. One of the Newcombe family of bellfounders from Leicester cast the tenor bell in 1618. Alfred Bowell of Ipswich, Suffolk cast the treble bell in 1907.[10]
