Season 5 of "Slow Horses" is even more ensemble-cast. After all, at this point, River Cartwright is no longer needed as the audience replacement. There's more Coe from the beginning. By now, I can see that Shirley's sporting a new dressing style in every season. And Roddy Ho turned out to be the worst person to be interrogated, due to his knowledge and self-delusion; which worked out fantastically for the show. One of the best shows, and 6 episodes per season is a sweet spot.