FJJP, exactly, and that simple argument is everything. That some still can't grasp it gives rise to the continual exchange in this forum.
Walter,
In terms of timescale, I would certainly expect that the order of dealing with any emergency or distraction of: Aviate, Navigate, Communicate would have made any distress call initiation way down the list.
You say:
If you look where waypoint A is on a chart/ OS map, you will see that waypoint A is already VERY CLOSE IN
You fall into the same trap as others. The position of the waypoint is utterly irrelevant. The way one flies VFR in SH Ops is to use prominent features as waypoints. That does not imply any intention to overfly them.
In this situation the obvious course would be to identify the Mull, change waypoint (simply to give rough predictions relative to arrival time and to keep the nav plot updated) and then turn left along the coast to the glen.
Why that didn't happen is the mystery.