Mill Hill Park Acton provides a good history: Richard White's widow sold the estate in 1859 and the fields north of the big house were developed (Mill Hill Road) while the house and grounds were occupied by a mercantile wool broker and his family. "Acton Hill House, the property together with its grounds was sold in December 1877 to the builder and property developer William Willett." Shortly after the house was partly demolished and modified to be much as it is now. Also the grounds were developed into residential streets - the Mill Hill Estate of high quality housing.
Our picture shows Mill Hill Park Conservation Area - all the streets except Mill Hill Road were developed from the Acton Hill House grounds.