If the following conditions are met, D is authorised to deprive P of his liberty while a decision as respects any relevant issue is sought from the court.
The first condition is that there is a question about whether D is authorised to deprive P of his liberty under section 4A.
The second condition is that the deprivation of liberty—
is wholly or partly for the purpose of—
giving P life-sustaining treatment, or
doing any vital act, or
consists wholly or partly of—
giving P life-sustaining treatment, or
doing any vital act.
The third condition is that the deprivation of liberty is necessary in order to—
give the life-sustaining treatment, or
do the vital act.
A vital act is any act which the person doing it reasonably believes to be necessary to prevent a serious deterioration in P's condition.