In one of Jeffery Archer's Prison Diary books (written ca. 2002) he asks a fellow inmate, a PhD student, whether he is "a digger or an academic".
What is the meaning of "digger" in this context? I see occasional use of the term "goal digger", an obvious play on "gold digger", presumably someone who just wants collect the credential versus one who intends to pursue a career in academia.
Would that be a correct guess as to the meaning?