David Brent works for Lavichem, a bathroom supply firm, in David Brent: Life on the Road. The 2016 film presents him as a sales representative there, fifteen years after his time at Wernham Hogg.
Lavichem is a deliberate change from the fictional paper merchant that defined the television series. Brent has lost much of his former status and is no longer the manager of a Slough office. Instead, he tries to revive his music career while working a sales job and funding a tour with money from his pension.
The film’s workplace is populated by colleagues including Pauline, Nigel, Jezza and receptionist Karen. Brent’s relationship with the job is less triumphant than in the television series: he is unhappy, experiences bullying from colleagues and remains desperate for recognition.
The answer is not Wernham Hogg, which is where Brent worked in The Office, and it is not Dunder Mifflin, the paper company in the American adaptation. Cooper & Webb is another name associated with Brent’s motivational-speaking work, not his employer in the film.