Anna Maxwell Martin excels as a good MP, while James Corden’s ex-soldier shows he can be dark as well as funny

A drama featuring a face-off between an MP and a constituent outraged by the failings of the system might be considered provident timing a week before election night.

But Joe Penhall’s drama is a very different animal from the quintessential political play, with no cynicism, spin or party politics, none of the brash polemics of David Hare nor the wide-ranging scope of James Graham.