A fresh bid to clear David Bain of the murders of his parents and three siblings is likely to go to the Privy Council in the next three months.
Mr Bain was released on bail in May last year after serving 13 years in prison for their murders in 1994.
His convictions were quashed by the Privy Council, which said there had been a substantial miscarriage of justice.
A retrial is scheduled for February next year.
The head of Mr Bain's legal team, Michael Reed, QC, says their petition to the Privy Council outlines new evidence that was not available at the last hearing.
It is not known when or if the Privy Council will hear the petition.