Police probing allegations that Jeffrey Epstein’s victims were trafficked into Britain will not be able to bring charges unless new victims come forward, it was claimed on Monday.

Eleven police forces are examining Epstein-related allegations, with the majority focusing on claims that the paedophile trafficked women via UK airports and RAF bases.

But sources have revealed the coordinated national police effort will stall without new victims coming forward, as many flight logs have been destroyed and some officers are struggling to find evidence to justify launching a formal investigation.

Gordon Brown has written to six police forces, including Scotland Yard, demanding detectives examine documents released by the US Department of Justice, which includes passenger manifests showing unidentified women travelling with Epstein.

The former prime minister wants police to interview Andrew Mountbatten-Windsor as part of a criminal investigation over claims that Epstein trafficked women to have sex with the ex-prince.

But insiders say it is not realistic to bring a prosecution on the US documents alone.

Some of the flights occurred more than two decades ago and passenger records are likely destroyed.

The RAF retains passenger manifests for only three months before they are destroyed, while commercial airline manifests for UK carriers are generally kept for six to seven years, according to the Civil Aviation Authority.

Eleven police forces are examining Epstein-related allegations, with the majority focusing on claims that the paedophile trafficked women via UK airports and RAF bases

Although there are details of passenger manifests and flight logs in the Epstein files, some of the records are incomplete with those identified on board only as ‘females’.

In December, a BBC investigation found 87 flights linked to the convicted sex offender had arrived or departed from UK airports between the early 1990s and 2018, some with British women on board.

One of the British women who testified against Epstein’s accomplice Ghislaine Maxwell was listed as having been on more than ten flights paid for by Epstein in and out of the UK between 1999 and 2006.

Mr Brown has also urged police to interview civil servants and airport staff. Scotland Yard, which is one of the forces looking at the trafficking allegations, has confirmed that no other victims have yet come forward.

The force has now urged close protection officers formerly assigned to Andrew to assist, but a spokesman stressed ‘no new criminal allegations have been made to the Met regarding sexual offences said to have occurred within our jurisdiction’.

None of the forces examining claims of trafficking have launched a formal criminal investigation or contacted the Crown Prosecution Service, apart from the Met.

In contrast, Thames Valley Police’s separate investigation into the former Duke of York is more advanced. Last week Andrew was arrested on suspicion of misconduct in public office over claims he leaked confidential information when he was the UK’s trade envoy.

The same force is also probing claims that Epstein sent a woman to the UK for sex with Andrew in 2010.

Andrew has previously denied any wrongdoing.

The National Police Chiefs’ Council (NPCC) has set up a national coordination group to support the number of forces involved. An NPCC spokesman said enquiries ‘may take some time due to the volume of material and the complexity of international jurisdictions.’