Peter Moore was seen in an earlier video last year
The kidnappers of five Britons held in Iraq for nearly two years have sent a new video of the captives to the British embassy in Baghdad.
The video shows one hostage, Peter Moore, saying the five are being treated well, Channel 4 News said. He calls for their release.
The video was shot eight days ago and has not been released to the media.
A Foreign and Commonwealth Office spokesman did not give details but said it was a "significant development".
The spokesman said: "Needless to say we are continuing to work actively for the safe release of all of the hostages."
The five Britons, whose names have never been officially released, were seized by a group of around 40 gunmen wearing police uniforms at the Iraqi Finance Ministry in Baghdad in May 2007.
At the time, the kidnapping was blamed on members of the Mahdi Army, a radical Shia militia controlled by outspoken cleric Muqtada al-Sadr.
The kidnapping is thought to have been carried out after British troops killed the militia's commander in Basra, in southern Iraq, a week before.
In February 2008 a video was released in which Mr Moore, from Lincoln, said: "My name is Peter Moore, I have been held here for nearly eight months now."