▁An ▁assess ment ▁carried ▁out ▁by ▁the ▁Mo D ▁after ▁the ▁incident ▁stated ▁that ▁the ▁event ▁would ▁occur ▁only ▁every ▁ 1 1 5 ▁years . ▁It ▁was ▁revealed ▁prior ▁to ▁sent encing ▁that ▁Martin - B aker ▁had ▁passed ▁this ▁information ▁to ▁Mo D ▁before ▁ 1 9 9 0 , ▁so ▁had ▁no ▁oblig ation ▁to ▁do ▁so ▁again ▁in ▁ 1 9 9 0 . ▁In ▁court , ▁it ▁was ▁claimed ▁Mo D ▁never ▁had ▁this ▁information , ▁from ▁ 1 9 5 2 ▁on . ▁An ▁R AF ▁training ▁film , ▁Mo D ▁Air ▁Publications ▁and ▁air cre w ▁& ▁engineer ▁witness es , ▁proved ▁otherwise ; ▁but ▁the ▁Health ▁and ▁Saf ety ▁Executive ▁ad vised ▁the ▁judge ▁that ▁this ▁was ▁irrelevant . ▁ ▁After math ▁and ▁pro sec ution ▁Martin - B aker ▁have ▁since ▁designed ▁a ▁small ▁metal ▁plate ▁to ▁go ▁over ▁the ▁SF H ▁which ▁prevents ▁accident al ▁firing . ▁This ▁had ▁been ▁proposed ▁a ▁number ▁of ▁times ▁but ▁always ▁rejected ▁by ▁Mo D . ▁Additionally ▁they ▁have ▁created ▁a ▁new ▁b olt ▁that ▁cannot ▁be ▁over - t ight ened ▁and ▁will ▁hold ▁the ▁main ▁par ach ute ▁in ▁place ▁until ▁the ▁e jection ▁seat ▁is ▁initi ated ▁and ▁stabil ised . ▁This ▁shoulder ▁b olt ▁had ▁previously ▁been ▁removed ▁from ▁the ▁M k 9 ▁seat ▁design , ▁with ▁the ▁Mo D ' s ▁agreement . ▁Training ▁on ▁e jection ▁seats ▁in ▁the ▁Royal ▁Air ▁Force ▁was ▁changed ▁after ▁this ▁event . ▁ ▁The ▁Crown