Channel 4 has been ordered to disclose further material relating to its documentary, Diana: The Witnesses In The Tunnel.
Mr Justice Eady, sitting at the High Court in London, ordered that the material should be disclosed to Lord Justice Scott Baker, the Diana inquest coroner.
The order relates to material containing accounts by witnesses of “relevant events” given to the programme-makers.
It includes material relating to two confidential sources.
Mr Justice Eady refused Channel 4 permission to appeal against the part of his order concerning confidential sources.
But Channel 4 can apply directly to the Court of Appeal in a bid to challenge his ruling.
At a previous hearing, Mr Justice Eady order Channel 4 to disclose certain untransmitted footage of interviews recorded for the hour-long programme, which was broadcast in June.
The judge did not announce his reasons for his decision today, but said he would give a full judgment as soon as possible.