The review was carried out after the material was discovered last year.

Kenova chief Sir Iain Livingstone has written to Northern Ireland Secretary of State Hilary Benn raising his concern at the late disclosure.

The Sinn Féin leader said a report into the operation of the British Army’s top agent inside the IRA was ‘deeply shocking’

Operation Kenova examined 101 murders and abductions linked to the Provisional IRA’s so-called ‘nutting squad’.

Kevin Winters, who represents 12 families directly impacted by the report, said there now needed to be a public inquiry.

The agent in the internal security unit of the IRA is widely believed to be Belfast man Freddie Scappaticci.

It is understood that the person rumoured to be the agent, Freddie Scappaticci, will not be named in Friday’s report.

Northern Ireland’s Public Prosecution Service concluded there was insufficient evidence to provide a reasonable prospect of conviction.

Stakeknife worked within the IRA’s notorious ‘nutting squad’, interrogating suspected informers during the Troubles.