Tinribs, may I ask if you have read The Inconvenient Truth? You seem to be making similar assumptions to the ROs. The aircraft was Released to Service by means of an illegal RTS. It was not permitted to fly for any reason, operational or otherwise. The problem was no-one told those that were operating it. You would have to ask the MOD/RAF why it was especially selected for this mission. The a/c captain (and detachment commander) pleaded for a substitute type, any one would suffice. He was denied. Where was the marginal en-route weather? The only cloud that impinged on its tragically short flight was the orographic cloud hugging the slopes of the Mull. It is a well known local phenomena and the planned track should have kept them well clear of it. It didn't. Why not? That is the unresolved issue, the unanswered question that demands a new and independent air accident investigation be initiated. The MOD demanded new evidence. It has got new evidence, but it is time it stopped investigating itself and let someone else do the job, for this and every other military air accident.
I think if you read David Hill's book you will better understand that many of your questions are based on misinformation. That is something (the only thing?) that the MOD does really, really, well.