Hi Dulfin13
The OPG regulate deputies, who are appointed by the Court of Protection (COP).
It has been a few years now, since the OPG actually acted as deputies themselves (although I think they still do have a small number of cases), as it was seen as a conflict of interest to be a regulator of the industry, while still managing cases themselves.
Thus I suspect you might mean that another organisation or individual is acting as deputy for the person you mention?
If an individual regains mental capacity, then the assigned deputy is required by law to relinquish their deputyship of the individuals affairs.
Regards
Andy