In 1552 St Mary's had four bells plus a Sanctus bell, and in 1631 Ellis I Knight of Reading, Berkshire cast a ring of five bells. It now has a ring of eight. Ellis II & Henry III Knight recast what are now the fifth and eighth bells in 1673. Thomas Rudhall of Gloucester cast the treble, second and third bells in 1771 and the tenor bell in 1772. In 1848 William Taylor of Loughborough, who at that time also had a foundry at Oxford, cast the sixth bell. In 1825 W & J Taylor also cast the present Sanctus bell.