Recent posters remind me of two aphorisms attributed to the great economist, John Maynard Keynes.
1. There are only two kinds of economic forecasters: those who don't know what will happen and those who don't know that they don't know what will happen.
Similar attitudes, with the timescale reversed, are all too common on this thread. Nobody, but NOBODY, will ever know precisely how and why the Chinook flew into cumulo-granite. End of story.
2. When accused of having changed his mind, Keynes replied "When the facts change, I change my opinions. What do you do, Sir?"
In this case, it is now abundantly clear that the "facts", as presented to the BoI, have changed radically. Why, then, have W & D not changed their opinions?
Roll on Lord Philip's report!