British diplomats are confident that Scotland Yard detectives will soon be allowed to visit Libya to investigate the murder of WPc Yvonne Fletcher.
But they say the move will have to await the formation of a new Libyan government to replace the National Transitional Council (NTC) which overthrew Colonel Muammar Gaddafi's regime.
WPc Fletcher was shot dead while policing a protest outside the Libyan embassy in London in 1984. Her killers have never been brought to justice.
ThePrime Minister David Cameron and the Foreign Secretary William Hague have raised the issue with the NTC as well as concerns over the fate of Lockerbie bomber Abdelbaset al-Megrahi.
A senior British diplomat said: "They know about it because we told them about it. We told them we wanted to pursue them [these issues] vigorously as soon as they have a new government."