tucumseh will be along shortly, to explain that procedures for Special Trial Fits (STF) were robust, with a review period before formal modification, and that these procedures were wilfully & negligently ignored.
Engines
Note I'm not advocating a witch hunt.
I am. But that is fairly irrelevant. The MoD approaches flight safety by crossing its fingers and hoping for the best.
When it all goes wrong, it avoids scrutiny by admitting 100% liability (following a long period of obfuscation) and paying up.
Unfortunately, it is the no-win, no-fee lawyers who will hold them to account.