It is, in all likelihood, nothing of the sort. The feature is a terrace, roughly 1.1 metres high, sweeping in an arc from the north-west to the north-east of the house. The house itself, along with its yard buildings, sits on the raised platform that this terrace defines. In other words, the ground was deliberately shaped to carry the buildings and their surroundings, making the terrace and the architecture part of a single, composed arrangement rather than two separate things.

The confusion over what the feature actually is stems from the gap between two Ordnance Survey maps. It does not appear on the 1837 six-inch map at all, which might ordinarily suggest some antiquity, since early mapmakers were reasonably thorough about recording earthworks they encountered. But when the six-inch map was revised and reissued in 1913, the feature appears as a hachured arc of about 25 metres in diameter, the kind of shorthand surveyors used for a curved bank or ridge in the landscape. That depiction was enough for compilers of the Record of Monuments and Places in 1995 to include it as a possible enclosure, the category typically applied to circular or subcircular earthworks that might be prehistoric or early medieval in origin. The absence from the 1837 map, though, points in a different direction: the feature was almost certainly created sometime between those two surveys, as part of the landscaping of the house and its grounds.