In the late 20th and early 21st centuries, geophysical surveys have confirmed the size of the stone circles and identified additional pits and postholes.

It is a large stone close to Hautville Quoit Farm, recumbent since at least the mid 17th century but assumed to have originally been upright.

[10] Described by Stukeley in 1723 as being 13 feet (4.0 m) long,[11][12] it is now about half that length, Leslie Grinsell suggesting that fragments have occasionally been broken off for mending the roads.

[13][14] Further to the west is a cove of two standing stones with a recumbent slab between them, which can be found in the garden of the Druid's Arms public house.

[16] In 1740 the site was surveyed and mapped by architect, freemason and antiquarian John Wood, the Elder, who noted the different stones used.

This deeply influenced his plans for a circle of 30 houses called The Circus in Bath, an ambitious architectural project completed by his son John Wood, the Younger.

[20] When one of the stones fell in the mid 17th century, some human bones were discovered accompanied by an object described as a "round bell, like a large horse-bell".

[21][22] Geophysical work by English Heritage in 1997 revealed a surrounding ditch and nine concentric rings of postholes within the stone circle.

[23][24][25] Analogous with the circles of postholes at sites at Woodhenge, Durrington Walls and The Sanctuary, it is thought that the pits would have held posts which would have either been freestanding or lintelled as they could not have supported a roof at that size.

The postholes in nine concentric rings held posts up to 1 metre (3.3 ft) in diameter indicating the use of ancient trees which were sacred to the druids.

This involved high data density magnetometer, resistance pseudosection profiles and photographic surveys showed a new henge entrance and further detail of post holes.

(Enter iron gate on L. a few hundred yards before reaching tollhouse, and search backwards along the hedge bordering road.)

It is a large stone, which legend says was hurled by Sir J. Hautville (whose effigy is in Chew Magna Church) from the top of Maes Knoll.

Standing apart from the circles is a curious group of three stones huddled together in a garden abutting on the churchyard, from which they can be easily seen by looking over the W. boundary wall.