SAS
What do you think the crew would have been looking at displayed on the HSI if they were completing a localiser approach - it seems from the report they were tracking parallel to the localiser 1 mile left? And even if they thought the middle marker was the outer marker, why would they not have seen from the DME readout that this was incorrect?
How could such errors possibly be training, management, policy or SOP errors? Wasn't it just largely basic crew error, with mitigation for poor radar vectors?