What do a harassed school teacher and his sulky fourteen year-old student have in common? The services of a “sex worker” who happens to be the sister of another of the teacher’s pupils.

Ian Winterton’s choppy, brutal little play, directed by Trevor MacFarlane, turns the spotlight on all sorts of other, related issues, too: discipline in schools (can a pupil really tell a deputy head to “F*** off” and be given only an hour’s detention?), the mixing of traditional schools with academies, and even bribery among staff and pupils.

The sex worker is her devastated sister’s primary carer, so this brings another element of responsibility into play, and we see the adulterous teacher’s wife, also a teacher at the school, dealing with it. Or trying to.

Meanwhile the deputy head, who also runs the school’s cadet force, and dresses up in battle fatigues once a week, tries not to rock the boat with phone calls in high places.

It’s all feistily done in this white brick, cave-like little venue under the George IV Bridge, and there are strong performances from Ruth Middleton as the prostitute, William Hutchby as the repellent mop-haired schoolboy and Oliver Devoti as the surreptitious, lily-livered teacher.