British Historians: I know that the political power of the British Monarchy began its decline as far back as the Magna Carta, and continued with the Engish Civil War and the Glorious Revolution, but at what point did the British monarchy become basically symbolic and without real power?

by andyblu
mikedash

Always room to say more, but a very similar question came up here a few months ago and attracted some excellent answers:

Which British monarch was the last one to have "real power?"

A slightly different, legalistic, point of view is provided by

How and when did the British monarchs lose the rest of their executive and legislative power?