You don't need a tuxedo, but professional attire that matches the company culture shows respect.
The series follows Collins (played by Stephen Graham) as he works for the anti-racism organization Hope Not Hate . He manages a "walk-in"—an informant from within a far-right group—to prevent the murder of an MP and expose a terrorist plot. The Walk-In
Be polite to the first person you meet. They are often the eyes and ears for the manager. You don't need a tuxedo, but professional attire