A former British spy in Sinn Féin has expressed fears that if prosecutions are taken against senior party figures and IRA veterans, it could have an impact on Brexit and the restoration of Stormont.

A senior IRA figure who became one of Britain’s most prized spies in the North has been linked to at least 18 murders.

The murky world of a double agent has been exposed

The British army’s top agent inside the IRA was in hiding today after his cover was blown in an exposure that rocked the republican movement to its core.

Scotland Yard chief John Stevens could quiz the British army’s top spy inside the IRA about a spate of sectarian murders within days, it emerged today.