I quote three excerpts from the same article in Wikipedia:
Though the ultimate executive authority over the government is still formally by and through the royal prerogative, these powers may only be used according to laws enacted in Parliament and, in practice, within the constraints of convention and precedent.
This seems to imply that the government fulfill, as it were, the will of royal prerogative by legislating.
The authority to use the sovereign's formal powers is almost all delegated, either by statute or by convention, to ministers or officers of the Crown, or other public bodies. Thus the acts of state done in the name of the Crown, such as Crown Appointments, even if personally performed by the monarch, such as the Queen's Speech and the State Opening of Parliament, depend upon decisions made elsewhere.
Once again, this implies to me that the ministers and other public bodies are appropriating the sovereign's inherent authority.
However, see paragraph No. 3:
Although the royal prerogative is extensive and parliamentary approval is not formally required for its exercise, it is limited. Many Crown prerogatives have fallen out of use or have been permanently transferred to Parliament.
So which is it? does the crown still retain symbolic authority, with (almost) all practical power in the hands of the government? Or is even the symbolic authority no longer in the hands of the monarch?