With the Americans about to enter a deep recession, I wouldnt mind betting the importance in the "special relationship" is about to dissapear. Especially as its likely they will drag us down with it.
As for Bush, a political dead duck. Just watch and see what happens in the run-up to the election. Republicans will drop him like a stone (possible impeachment?) IMO, the man is a war criminal.
As for the Petraeus report, to be taken with a pinch of salt, as I bet the politicos and corporate comms people at the WH will have had their filthy paws over writing it. Petraeus is hardly going to admit defeat is he?