Gary Oldman’s portrayal of Jackson Lamb continued to be the series' anchor, noted for his "sarcastic attitude and heavy presence".
Jackson Lamb tracks Katinsky to a remote location. In their final confrontation, Katinsky reveals his personal vendetta: he blames Lamb for the death of his former colleague. Rather than being captured, Katinsky chooses to take his own life after Lamb exposes the futility of his mission.
"Old Scores" effectively closed the book on the Dead Lions adaptation while setting up the future of the series.
The episode ends with Slough House remaining open, its "misfit" residents surviving another day despite the political machinations of Regent's Park (MI5 HQ). "Slow Horses" Old Scores (TV Episode 2022) - IMDb
Reviewers on IMDb gave the episode a 7.5/10 , noting that while it delivered strong emotional beats and resolved the season's arcs, it felt slightly more deliberate in pace compared to the high-intensity penultimate episode.