Journalist Mona Chalabi sets out to test whether Britain's self-image as a tolerant, post-racial society matches how people actually behave. Rather than relying on opinion polls, she designs and runs a series of real-world experiments and controlled studies, putting people of different races into identical situations, from job applications to everyday social encounters, to see whether they are treated the same. She talks to psychologists, statisticians, and members of the public about unconscious bias, and pushes back on interview subjects who insist prejudice is a thing of the past. The film uses hidden cameras and hard numbers rather than anecdotes to make its case, tracking who gets called back, who gets served first, and who gets the benefit of the doubt. Chalabi keeps her own reactions in frame, visibly unsettled by some of what the data shows. The result is less a verdict than a measurement: a snapshot of where Britain's stated values and its measured behavior diverge.