It is a challenge to write about England’s preposterously dismal performance in the Test series without dealing more in the vocabulary of psychiatry than in that of cricket. Trying to understand how a reasonably good, but not top-notch, Australian team could mince an England side that had, a few months earlier, won the Ashes 3-0 does, however, lead one inevitably to questions of mental fitness rather than of physical aptitude, not least since one of England’s prime batsmen, Jonathan Trott, went home with depression early on: though there is a little more to it than that.