I don’t recall Dr. McGrath’s specific position on prophecy, but I tend to be a couple of notches more conservative than he is on many issues, while not being drastically different.

My own view is that the intent of prophecy is not prediction but admonition. It is more of a “this will happen if that continues” or “I will do x if you do y.” I expand on this view in my book When People Speak for God..