 The church has long standing connections with Sir William Harpur and Dame Alice Harper, and the Trinity Chapel holds brasses of the couple.Sir William was the Lord Mayor of the City of London in 1562, and his Harpur Trust (which has a long history of operating independent schools in Bedford) has donated many of the stained glass windows in the church.Other improvements in the 15th century included Misericords in the Quire (or chancel) and two additional porches.