completed 1520.
The north aisle has a moulded plinth and parapet, plain stepped buttresses with decorated gablettes, figures and pinnacles.
In the west end a C15 5-light window.
The 2nd bay from the west has a doorway with pointed moulded surround and traceried C14 door.
The clerestorey is of 14 bays with closely set 2-light windows, quatrefoil frieze to parapet and flat pilaster buttresses with decorated pinnacles with statue niches, some containing original carved figures.
The inner doorway has 3 thin shafts and moulded surround and late C14 traceried door.
High up, at the top of the second stage is a star lierne vault by GG Pace, using the springers of an unexecuted medieval vault.
The south doorway has on the inside 2 wide chamfers and hood mould on head stops, and the dovetailed planks of the C14 door can be seen.
Choir stalls of c1390 with good misericords.
C17 parish chest.
Door knocker on south tower door of C13 with lion's head.
Charles I coat-of-arms and 10 hatchments in the tower.
Stained glass: by M & A O'Connor 1853, Kempe 1889, Burlison and Grylls 1944 and others.
A window in memory of Benjamin Dyer d.1931 and his wife Katherine d.1939. The window depicts four figures representing the Guilds of Boston. Saints Peter and Paul frame St George and the Blessed Virgin Mary, Patron Saint of the largest Guild. Below commemorates a performance of handel's Messiah at a Festival of Music, 1807, and The American Ambassador re-opening the refurbished Cotton Chapel, originally known as the Founder's chapel, in 1857. Glass by H. Grylls, 1947.
2 busts of c1400 - Walter Pescod and wife d 1398 and a priest c1400.