code

Air traffic control systems handling the flight were confused by a duplicate code - DVL - representing both Deauville in France and Devil's Lake in North Dakota, USA.

Speaking to journalists following Gray's statement, First Minister John Swinney said he would not refer the health secretary for an investigation under the ministerial code.

Scottish Conservatives called for a parliamentary investigation under the ministerial code.

Gray said the ministerial code makes clear that family members or guests can accompany a minister.

A separate thread in the series follows the McConville children over the decades, as they fight an impenetrable code of silence to uncover the truth about their mother.