IIRC
The change to WP B, Corran, was made about 1-2 miles before impact - perhaps close the yachtsman afloat - where the weather was, more than likely, suitable for VFR (>3-400ft cloudbase and >1nm vis, COCIS - but probably better than that). That undermines somewhat the ROs' assertion that the crew were negligent before the WP change.
flipster