The fictional shadow cabinet minister at the centre of this darkly comic blackmail thriller is offended when the male prostitute he has hired describes his reputation as “colourful”. Colourful MPs support bloodsports and wear bow ties, he says; he prefers the term “maverick”. It’s never said out loud, but clearly he sits on the right in political terms; you can tell from the sneer in his voice as he utters the word “proletariat”.Executioner is adapted by Peter Benedict from his play Deadlock, with a staginess that feels a bit much for the screen. Benedict also co-directs and stars as the...