The man who has fought to find WPC Yvonne Fletcher's killer has told ITV News he is demanding answers after new details of Libyan warnings.
Two detectives have visited Libya as part of the ongoing investigation into the murder of WPC Yvonne Fletcher.
A review of the events surrounding the death of Wpc Yvonne Fletcher from the murder to today's announcement.
Libyan justice minister Salah al Marghani has said the country is offering Britain full transparency and help in bringing WPC Yvonne Fletcher's killer to justice.
"It is another crime of the Gaddafi regime and there is full cooperation in this case and we have 100 per cent open lines with the UK on these issues," Mr al Marghani said.
Newly released government files have shown Libya twice warned the UK of potential violence on the eve of the shooting of Ms Fletcher outside the Libyan People's Bureau in London in 1984.
The gunman who fired the fatal shot from inside the embassy has never been identified.
The former British ambassador in Tripoli has told ITV News he took a threat of violence on the eve of the shooting of WPc Yvonne Fletcher "seriously" after it was revealed he bet a Libyan diplomat that nothing would happen.
Oliver Miles was summoned to the Libyan foreign ministry shortly after midnight on April 17 1984 to receive a warning of possible violence if a planned demonstration by opponents of Colonel Gaddafi went ahead that day outside the Libyan People's Bureau in London.
Mr Miles filed a telegram to the Foreign Office (FCO) reporting the warning, one of a number of documents released under the 30-year rule by the National Archives.
Other papers show two officials from the People's Bureau also telephoned the FCO to express concern about the demonstration the next day.
"I did take it seriously and that's why I reported it to London," Mr Miles told ITV News. "I didn't know, of course, that there was going to be a shooting. I thought they were simply trying to have the demonstration stopped."
Libya twice warned the Foreign Office of potential violence on eve of the shooting of WPC Yvonne Fletcher outside the Libyan People's Bureau in London, according to newly-released government files.
Papers from 1984 released by the National Archives in Kew, west London, show Libyan officials in both London and Tripoli warned they would not be answerable for the consequences if a planned demonstration by opponents of Colonel Muammar Gaddafi went ahead.
However they seem to have been regarded as little more than typical Libyan bluster - with Britain's ambassador even placing a bet that nothing would come of it - despite repeated intelligence reports that weapons, explosives and "assassins" were being assembled at the People's Bureau.
Twenty five-year-old WPC Fletcher was killed on April 17 1984 when a gunman inside the bureau building in St James's Square opened fire with a submachine gun on the protesters and police outside.
The Metropolitan Police has confirmed two detectives from the MPS Counter Terrorism Command have travelled to Libya, as part of the ongoing investigation into the murder of WPC Yvonne Fletcher.
They flew to Tripoli following a request from the Libyan authorities for officers to revisit.
The officers are due to meet Libyan officials to take forward preliminary discussions they held last month with a view to working jointly to identify who was responsible for WPC Fletcher's murder.
WPC Fletcher was policing a demonstration outside the Libyan Peoples' Bureau in St James's Square on 17 April 1984 when she was shot and fatally injured by a bullet fired from the building. Ten Libyan demonstrators were also injured in the incident.
The Foreign Secretary William Hague has tweeted:
Received assurances from Libyan PM on cooperation with UK to bring justice for WPC Yvonne Fletcher and other UK victims of Qadhafi
The Foreign Secretary William Hague is expected to discuss a suspect named in connection with the killing of WPC Yvonne Fletcher when he meets the Libyan government today, according to The Times (£).
Salah Eddin Khalifa was named as a potential suspect in the shooting outside the Libyan embassy in London in 1984 by a senior advisor to the Libyan Prime Minister Abdurrahim al-Keib.
The advisor, Ashur al-Shamis, told The Sunday Telegraph that Mr Khalifa was alive and living in Libya.
Two detectives from the Metropolitan Police have visited Tripoli, Libya, as part of the ongoing investigation into the murder of WPc Yvonne Fletcher in 1984.
Libya's former head of intelligence holds the key to solving the murder of policewoman Yvonne Fletcher, the Libyan prime minister has claimed.
Abdurrahim El-Keib, who has visited the spot where Wpc Fletcher was shot dead outside Libya's London embassy in 1984, told The Guardian Abdullah al-Senussi was the "black box" who would know who carried out the killing.
Senussi, one of Muammar Gaddafi's most senior henchmen, fled Libya last year and was arrested in Mauritania in March.
He is wanted by the International Criminal Court for crimes against humanity. He is also suspected of involvement in the Lockerbie bombing.