The "hostage" - wearing orange clothing similar to the jumpsuits worn by detainees in Guantanamo Bay - speaks eloquently to the camera in a British accent for around three minutes, but unlike previous İSİL videos featuring western hostages he is not beheaded.
İSİL has released three videos featuring beheadings, each carried out by another man with a seeming British accent.
In the last, it threatened to kill British aid worker Alan Henning.
In Thursday's video - titled "Lend Me Your Ears" and addressed to the Western public - the man asks why he and others have been abandoned by the U.K. and U.S. governments, when other European governments have negotiated for the release of their hostages.