vecvechookattack
Are they under pressure from the familes of those who were killed?
No. Indeed some, notably Susan Phoenix, have been active members of the campaign to overturn this unjust finding.
Are they under pressure from the Conservative party?
No. In fact some notable Tories have voiced their unease at the verdict and have called for it to be overturned, including John Major (PM at the time), Malcolm Rifkind (Def Sec at the time) and David Davies.
The sole reason I can see for the current obtuseness of the MoD is that they see it as a willy-waving contest. Why, I don't know. It's not as if the entire edifice of military discipline will come crashing down if they acknowledge that an Air Chief Minstrel made a mistake. In fact, respect for the chain of command would probably be greatly bolstered.