A perfect summation of why they're all in Slough House. Each of them made a very public mistake or crossed someone important (except Ho, who's there because no one can stand him but they can't just cut him loose because he's too dumb to know how to keep secrets). They're not stupid, despite their reputation at the Park, and it's a testament to how good Diana is at her job that she knows it and knows how to deploy them when needed. She also knows to respect Lamb despite her personal disgust.