What I saw when I went undercover

The 21-year-old whistleblower at the immigration removal centre

Callum Talley was so shocked by the chaos, violence and abuse he saw as a detainee custody officer in an immigration removal centre, he decided to become a whistleblower.

• Alison Holt
• BBC

Putting on hidden cameras for a BBC Panorama investigation, the 21-year-old exposes a toxic, brutal and failing environment, where self-harm and drug abuse are commonplace.

Ten staff and former staff have been suspended as a result of his allegations.

Callum changes into his uniform quickly.

He stops and looks in the mirror – one last check.

He’s making sure there are no…

• What I saw…