I think the major problems with the tech pubs was the fact that, for reasons known only to someone in procurement, we did NOT get/use the Lockheed Dash 1 (-1) documents .. but everything was transcribed/reissued/republished/screwed up* (* delete as applicable) to UK documents. It became apparent to me very early when doing "foreign" training (Belgians/Israelis/various Middle East crews etc) that the -1 had far more, and often more accurate/relevant information, than the UK versions did. Many an FE carried photocopied excerpts from the -1 to assist the grey matter when solving problems !- I know my limited grey cells needed all the help they could get !!