>>213778052 (OP)It’s ironic. He’s been given this amazing promotion and he’s finally at the head of the table, a position that would have greatly expedited his arduous investigation taken during the events of the movie.
But it’s a sham! He’s learned that all of his coworkers, now underlings, were fools whose very foolishness was used specifically to carry out the evil plan! Control, who Smiley was quite fond of, died directly due to the stress of the plot. And he’s lost a great friend and colleague in Bill Haydon. The Circus is actually in a much worse state than the beginning of the movie and he’s no closer to fixing its issues.