The more I read of this the more it seems that the MoD used that device in an attempt to slam the door on further enquiry which they feared would lead to hugely embarrassing revelations of their gross professional misconduct in various aspects of certification and operational use of the aircraft. The amount of sitting on files and obfuscation amongst the Top Neddies is pretty damning and reeks of a big, embarrassed cover-up at the highest levels.
Agaricus, that's just about the nub of the matter. Hence the reason for the Mull of Kintyre campaign.