"The Vote" follows the story of Kirsty Henderson (Catherine Tate), Laura Williams (Nina Sosanya), and Steven Crosswell (Mark Gatiss) who are clerks at a polling station in a south London school on the night of the 2015 election.
They deal with a cross section of the public, including Grace Botchway (Llewella Gideon) who falls down and is worried about people seeing her ballot. She is helped up by elderly Fred Norris (Timothy West), prompting Kirsty to recall fatalities she has known while on polling duty.
Swedish journalist Tilde Larson (MyAnna Buring) arrives as Kirsty has achieved some YouTube celebrity for breaking down the locked school doors in the morning. Selfies are strictly banned, but confusion arises when Fred is accused of voting twice, claiming to be his twin brother "Joe". Laura is shocked by the discrepancy, leading Kirsty to involve her non-voting husband in "rectifying" the situation.
Excited first-time voters, a quarrelsome couple, the school caretaker unhappy with Kirsty's actions, a daughter who registered her hospitalized mother but not herself, and vote-chasing candidates all pass through before the poll is closed.
Fred Norris' reappearance causes more confusion, and Kirsty has to explain why she voted on her neighbor's behalf, thinking she would be out of town. It has been a long day, especially for Steven, for whom it all proves rather too much.