When British intelligence agents make career-ending mistakes but aren’t fired, MI5 send them to Slough House, a purgatory of dullness run by the acerbic Jackson Lamb (Gary Oldman). When Slough House’s most recent arrival River Cartwright (Jack Lowden) is assigned to keep an eye on a journalist associated with far-right politicians, he uncovers a plot to attack Britain. This felt truncated, very much like a setup, rather than a full season. Interestingly they trailed season two at the end of episode six. Surely the talent above and below the line deserves more that a paltry six hours.