Harry
They'll try, but unfortunately one aircraft project team released under FoI the information that another tried to conceal, revealing MoD's guilt. Classic MoD. The HSE confirmed they had not seen it. Some would say they were then duty bound to report this to the judge. This report, and associated papers, proved that, even if M-B didn't send out a piece of paper in 1990, MoD knew of the precise risk in 1990 by another means, and in 1993, 1998......; because they'd consciously rejected the mitigation that would have eliminated it.
I do hope people here realise that a root cause of Flt Lt Cunningham's death was the same refusal to implement mandated regulations that was confirmed by Mr Haddon-Cave in 2009; which merely repeated the same warnings by the RAF Director of Flight Safety in 1992, 96, 97, 98....; and internal MoD audits from 1988.