The Throne of England is the throne of the Monarch of England. "Throne of England" also refers metonymically to the office of monarch, and monarchy itself. The term "Throne of Great Britain" has been
This view of the throne in the Palace of Westminster shows the House of Lords in session in the early 19th century before old palace was destroyed by fire in 1834.
The Crown is a political concept used in Commonwealth realms, analogous to the concept of the government in legal systems influenced by Roman civil law.
Throne of England
…at the State opening of Parliament. The English Throne is one of the oldest continuing hereditary monarchies in the world. In much the same sense as The Crown, the Throne of England becomes an abstract metonymic concept that represents the legal authority for the existence of the government. It evolved naturally…
King Charles III (wearing the Imperial State Crown), the living embodiment of the Crown in each of the Commonwealth realms
Balmoral Castle in Aberdeenshire, Scotland, a privately owned property of Charles III and not property of the Crown
Rideau Hall in Ottawa, Ontario; the seat of the governor general of Canada and a property of the Crown in Right of Canada
The mace of the Parliament of Queensland, symbolising the authority of parliament as derived from the Crown.