
The fifteenth century font is the most cherished possession of the church. It follows a type that is very common in East Anglia. The bowl has eight sides, on four of which are emblems of the Four Evangelists holding scrolls. The emblems are:
- an angel for St Mathew
- a lion for St Mark
- an ox for St Luke
- an eagle for St John
The other four panels are occupied by angels holding shields which respectively show the arms of St Edward the Confessor, the arms of the Diocese, instruments of the passion and the usual design of the Holy Trinity.
Around the stem are lions, and the whole is raised on two steps, as so often in East Anglia, thereby giving added dignity to the font. On the upper step is the following inscription "Oratr pro fratribus ac soribus ac benefactoribus gildae Sancti Johannis Baptiste de Castre".
The font cover was donated in 1970 in memory of the Rector, Canon T Blackhouse and was designed by Sir Bernard Feilden.