There is something about Goldman Sachs that encourages conspiracy theories. Observers are always convinced that nothing can possibly be as straightforward as it seems.

So the claim that after more than 30 years of well-compensated toil Michael Sherwood simply fancies a bit of a change is met with widespread scepticism. Why would someone who has long been seen as a potential successor to Lloyd Blankfein jack it in now? There must be more to it than that.