Can someone give me a source for this squib?

"Come in, Mr & Mrs Jones. You asked about your son's prospects after school. I have to say that his GCSE results are moderate, to put it kindly. His English is slipshod but passable, he has a shaky grasp of history and his mathematics is appalling. He does not think logically, so philosophy and science are obviously barred to him. He may, however, have the makings of a political journalist."