Former Special Forces personnel and 'psyops' operatives are attempting to apply propaganda tactics in an anti-radicalisation campaign designed to fight ISIL online.
The video shows a young British man trapped or imprisoned underground in Syria, reading a letter from his older brother at home in the UK.
Created by video agency Verbalisation, the video is part of the Quilliam Foundation’s #NotAnotherBrother campaign, which aims to highlight the effects of online radicalization.
A description accompanying the video says: "Isil are radicalising our brothers to fight in Syria.
"They are tearing families apart. Enough is enough. Sharing this film will show Isil that their extremist views have no place in our community. No family should lose another loved one to such hatred.
"Not another child. Not another sister. #NotAnotherBrother"