The roofs are clad in tiles except the vestry which is covered in slate
Gargoyles protrude from each side
The doorway has a moulded square surround with spandrels containing carved foliage and plain shields, a hoodmould, and an inner four-centred head
The west window, which was rebuilt in the C19 (a blocked window arch is visible above), consists of three cusped lights with moulded jambs and dropped tracery of C15 style under a four-centred head
The stained glass was a gift from the Nash family who ran a brewery in Bedford
The windows in the first, second and fourth bays (from the left) are probably C19 copies of C16 windows
Like the north chancel, it has one bay lit by a C19 window with three cinquefoiled lights with C15 style tracery
High in the east wall of the south transept is a round arched window of C10 or C11 date, now blocked with masonry
Just below it on the right is what appears to be the jamb of a C13 lancet, its other jamb being overlapped by the chancel wall
The central tower has heavy ashlar quoins, an embattled parapet with crocketted pinnacles and corner gargoyles, most or all of which were replaced during major repairs in 1994
The middle window, if there was one, has been destroyed by the insertion of two-light C15 windows with traceried heads and hoodmoulds
The upper stage has Norman round-headed openings on each face enclosing two smaller openings whose arches spring from a central shaft and shafted responds
The capitals are of Norman cushion type and, although the capitals of the responds are very weathered, there is evidence of a spiral volute
The gabled east side of the chancel is dominated by a C19 window which is set within C14 jambs
The stained glass, thought to be by Clayton and Bell, depicts the Crucifixion and four saints
The south side of the chancel has three bays, divided by three-tiered buttresses, and lit by C19 three-light trefoiled windows with traceried heads in C14 style
The jambs and heads are in part of C14 date
Below the window in the first bay (from the left) is a single-light trefoiled window with jambs of probably C14 date and C19 stained glass depicting St Mary
This has a distinctive moulded lintel consisting of a recessed circular motif flanked by wing-like shapes, giving the impression of an angel
It is lit by a large ten-light window with decorative leaded lights, set in a stone surround divided by mullions and a transom, and has the same distinctive carved lintels already described
The north arcade is thought to be C16 whilst the south arcade is a C19 replica
There is a Victorian timber screen elaborately carved with Gothic motifs across the west end of the nave which forms a western lobby and supports a gallery
The arch on the west side is decorated with a Victorian dogtooth hood-mould, and above it is a small round-arched Norman opening
In the south transept are two round-headed window of late Saxon date in the east and west walls
A larger splayed window was inserted below the earlier window in the east wall during the Norman period
This in turn was blocked up in the C14 and a mural was painted inside, a fragment of which remains
The chancel has a canted ceiling with timber ribs and slender beams which rest on moulded stone corbels decorated with painted angels or shields, all of C19 date
The church has a considerable number of marble memorial tablets dating from the C17 to the C19, mostly located in the chancel and sacristry
Amongst these is a Baroque memorial, carved in the form of a flowing cloth sheet, to Mary Lysons who died in 1682
and a neo-Classical monument depicting young people mourning at a pedestal with a palm tree behind
It was carved by J. Loft of 92 Dean Street, Soho, to commemorate Major William Mills who died in 1838