Good news, fans of misanthropic espionage dramas – Slow Horses is back. “We were all just rubbing our hands,” showrunner Will Smith tells Empire of where Herron’s novels steer this season. “And then you put him in a room with Gary Oldman. “For example, people think [Lamb] farts more than he does… In season 5, it’s only one… A weaponised fart. A story-based fart.” Ready to let rip?