Thornton was best known for his radical approach to the presentation of historic interiors at Ham House, Osterley Park and Apsley House.
Notable specimens include one at Osterley Park 14 m tall and 1.5 m girth, and the largest, 18 m tall, at Avondale Forest Park, County Wicklow, Ireland.
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Sarah Fane, Countess of Westmorland (née Sarah Anne Child; 28 August 1764 – 9 November 1793) was the only child of Robert Child, the owner of Osterley Park and principal shareholder in the banking firm Child & Co.