Caz,
Your post once again indicates your total lack of any knowledge of SH opererations.
Barometric altimeters mean nothing in low level ops, unless you have any chance of requiring an abort to high altitude.
Such an abort was not available and unflyable to the accident aircraft due to the icing level.
The turn left along the coast was available and (most likely) intended.
Why the aircraft continued to imact the mull in local fog is a mystery. It has nothing to do with subscale settings.
Clutch at any straw you like, you have NO evidence with which to assume Gross Negligence, any more than did Wratten and Day.