Willett bought the entire estate in 1890 [2] with the intention of building on it all but the venture was not successful and he erected only a small number of houses there and on Wilderness Road.
The remainder of the estate became the Chislehurst Golf Club with the mansion, Camden Place, becoming its clubhouse.
It was designed by Ernest Newton and a ballroom was added in 1903 by Amos Faulkner (Willett's in-house architect).
Derwent is a Grade II listed building located within the Chislehurst Conservation Area.
A blue plaque on that building commemorates Willett as the promoter of daylight saving time.