Gentlemen, go back to page 1 and read, or reread,
tornadoken's post.
No conspiracy theories, no dark deeds in the dead of night.
There was a better platform for the mission that delivered more with a better chance of success and a far better chance of survival, it was called Polaris. The whole concept of delivering nuclear bangs was moving over to missiles.
As an aside, that was something Leonard Cheshire had predicted in his report to HMG following his role as an observer to the Nagasaki bombing but was shelved without consideration at the time.
