DAVE’S HEAD FELT LIKE A WAR ZONE. HE KNEW HE’D FAILED TO follow his own instructions and drink enough water today. He’d spent the morning shovelling admin shit and drawing up rotas. By lunchtime the names and numbers looked like he was squinting at them through a heat haze, the ops room was an oven and he was dripping with sweat just leaning against the wall under a large piece of paper on which someone had written: