[1] To meet the growing size of Yeovil and the increased population, work on a second church, Holy Trinity, began on 24 June 1843,[3] and this relieved the pressures on St John's.

The tower has two-light late 14th century windows on all sides at bell-ringing and bell-chamber levels, the latter having fine pierced stonework grilles.

[6] Unusually, the stained glass windows include a depiction of a lone Judas Iscariot with a dark halo.

In 1855, the schoolroom was demolished and replaced by a new building next to the churchyard, also called the Chantry,[11] which had feoffees who appointed a schoolmaster.

[12][13] When the old schoolroom was demolished, it was estimated to date from the reign of Richard III, and some of its features, including two chimneypieces, were salvaged and built into the new Chantry, while the roof structure was copied.