Optically stimulated luminescence dating of excavated material showed that the mound was constructed around 2500 BC, and has been compared to Silbury Hill in Wiltshire.
She co-presented the documentary Silbury: The Heart of the Hill for BBC Four with Neil Oliver about the neolithic mound Silbury Hill in Wiltshire.
Written in 1977 and revised in 2003, it takes as its inspiration the prehistoric mound of Silbury Hill in Wiltshire, with its connotations of the spiritual and mysterious: the precise function of Silbury Hill remains unknown.
The hill's vegetation is species-rich chalk grassland, dominated by Upright Brome and False Oat-grass, but with many species characteristic of this habitat, including a strong population of the rare Knapweed Broomrape.
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Later tracks mix musical and spoken material on the subject of the Odin stone of Orkney, the neolithic hill of Silbury and the World Ash Tree, Yggdrasil.