That is known as the "Law of Energy Conservation". It is also known by the alternative name, "First Law of Thermodynamics".
It was destroyed during WW2
Burkle Estate was created in 1997.
Weeks Estate was created in 1912.
Grange Estate was created in 1685.
Gloninger Estate was created in 1785.
Endicott Estate was created in 1904.
Heygate Estate was created in 1974.
Heng On Estate was created in 1987.
Portman Estate was created in 1764.
Man's Estate was created in 1972.
Ashbridge Estate was created in 1793.
Knight Estate was created in 1830.