It’s not unusual to make pacts with friends – pinky promises and blood brother bonds – but not many swear to that loyalty well into their seventies, and even less agree to help end someone’s life. Despite the grisly plot, the two stars of new Channel 4 thriller Truelove, Lindsay Duncan and Clarke Peters, say that while they’d never worked together before, they had an absolute ball on set for one reason in particular. “All of the leads are in their seventies, which was great,” says Lindsay, 73, who plays Phil.