St Mary's churchyard walls, including walls lining approaches from Castle St, High St & Rose Hill St

St Mary's churchyard is surrounded by rubble-stone walls that connect to passages leading to the town's main streets. On the south side of the churchyard, east of the Rose Hill Street entrance, the wall stands 2 to 2.5 meters high. At the eastern end, where the wall has been partly rebuilt in brick, there are the bases of three buttresses. The east side features a lower rubble wall that rises to 2.5 meters high beyond the Castle Street entrance and an added corner building at the rear of No 12 Castle Street.

On the north side, the wall is overgrown, reaching up to 2 meters high east of the High Street entrance and 3 to 4 meters high to the west, where it is capped with cement. This section has been partly rebuilt and includes a lean-to structure in the churchyard. Flanking the lean-to are blocked segmental-headed former windows from a building on the outer side of the wall.

The west side of the wall reaches heights of up to 4 meters and is also cement-coped, north of the Church Street entrance. South of this entrance, the wall has been incorporated into a former air-raid shelter on the outer side (at the rear of No 5 Church Street), continuing southward with a height of 1 to 2 meters. This section features a buttress on the south side and has been breached to create an entrance to the Rectory.

The approach from Rose Hill Street has cement-coped walls that are 2.5 meters high on the east and 1.8 meters high on the west. The Castle Street approach includes a wall that is 1.8 meters high behind No 14 Castle Street, interrupted by an outbuilding, and 2 meters high on the north side behind No 12 Castle Street. The High Street approach has walls that reach up to 2 meters high on the east side, connecting with the rear wing of the Castle Hotel, while the west side features a wall that is 3 meters high and abuts the rear of No 11 High Street. Additionally, the wall on the west side meets the gate piers in Church Street, which are listed separately.