JP - 'So?' is that this logic seems to have completely escaped several of the 'higher' BoI members, who, like Caz and WK have 'assumed' that they were in either 'cloud' or 'fog' at this point and IMC. Say it often enough and people might believe it.
IF we accept that LOGIC says they were in sight of the Mull at WPT change, what on earth would possess ANYONE to continue voluntarily towards a cloud covered headland when one's route is planned to turn left and follow the coast up past Gigha and on? How this action can be assumed to be deliberate and thus grossly negligent I just cannot, like many others, see.