Just been to see this, the cinema was packed. A black comedy featuring a primary school teacher (Saoirse Ronan) who, under incredible pressure because of a violent and disruptive pupil and a looming Ofsted inspection takes matters into her own hands. Highly implausible but very well acted and entertaining. Lots to think about with the education system failing pupils who can't cope in a standard classroom environment and failing their classmates because of the ensuing disruption.