A LAW expert has called for an investigation into a "culture of unwillingness" at the Crown Office amid concerns over the case of David Gilroy, convicted of murdering his former lover despite no body being found.

Professor Robert Black, QC, one of the architects of the Lockerbie trial, said potential disclosure issues in high profile cases are a public concern and families and legal teams should not have to launch lengthy and costly court actions to access information that could be relevant to their case.

The family of Gilroy, three years into an 18-year life sentence for the murder of his Edinburgh bookkeeper colleague Suzanne Pilley, who was 38, are trying to clear the 52-year-old who was convicted without witness or forensic evidence five years ago.

They are challenging the Crown Office over the disclosure of information including CCTV footage from various locations which they say would give answers that would either prove or disprove their case.

In 2012 a damning SCCRC dossier over the handling of evidence in the Lockerbie bombing trial found the Crown failed to disclose seven key items of evidence and that had such information been shared with the defence, the result of the trial of Abdelbaset Ali Mohmed al Megrahi could have been different.

Mr Black, who prepared a live case for the commission for relatives of victims, said it was of concern the Gilroy case raised issues of disclosure practices and non-disclosure of evidence.

He said: "These are two of the items founded upon in the current Megrahi application and indeed were among the grounds of referral accepted by the SCCRC in its 2007 report on the Megrahi case.

"A serious question that arises and needs to be investigated is whether there was, and whether there still is, within the Crown Office a culture of unwillingness to comply with their duty of disclosure to the defence.

"This is not a matter that should be left to be raised in individual cases but should be addressed more generally, perhaps in the Justice Committee of the Scottish Parliament."

The circumstantial case was enough to convince the majority of a jury that an early morning encounter between the two had ended in married father-of-two Gilroy throttling the woman who spurned him in a jealous rage.

Prosecutors argued that he concealed her body in the basement of the offices where they worked and then the boot of his car before disposing of her remains next day somewhere in the Argyll forest.

Advocate Depute Alex Prentice QC said during his trial that when the individual strands of evidence presented were bound together they formed a cable and the strength of the case.

The Gilroy family have taken their case public because they believe so far the Scottish justice system has let them down.

His case is currently being examined by the Scottish Criminal Cases Review Commission which could lead to a new appeal being heard.

Details of the SCCRC case are confidential, but the Gilroy family have echoed broad concerns over the disclosure of evidence.

A Crown Office spokesman said that "Gilroy was sentenced to life imprisonment having been found guilty by a jury after trial".

"The Crown has a duty of disclosure throughout proceedings, which was fulfilled."

A spokesman for Police Scotland said officers could not comment as the case is subject to SCCRC review.

In Lockerbie case, three of the undisclosed documents related to payments of around $3 million (£1.9m) made by the US Justice Department to Paul and Tony Gauci - key witnesses in the Crown's case who claimed Megrahi bought clothes in his Malta shop, which were later found to be in the suitcase that contained the bomb which killed 270 in December 1988.