Jim Swire, whose daughter Flora was among the 270 killed, said yesterday a desktop review of the criminal inquiry has always been the excuse to block a full investigation into how Pan Am flight 103 exploded over Lockerbie on December 21 1988.

In a letter in today’s Herald, Dr Swire states: "The ‘ongoing criminal investigation’ has been repeatedly used as a reason for denying us the full inquiry into the truth, to which we are entitled under human rights law and now the Inquiries Act 2005."

He also told reporters yesterday: "I think if they are really going to have a meaningful investigation then that is all well and good and long overdue. But if it is just a dodge to prevent an investigation into why the lives of those killed were not protected then I would be livid."

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Dr Swire is among many who do not believe that Abdelbaset Ali Mohmed al Megrahi, the Libyan agent convicted of the bombing in 2001 and released in August on compassionate grounds, was guilty of the atrocity. Days before his release Megrahi, who has inoperable cancer, dropped his second appeal against his conviction, although he has always protested his innocence.

Eleven relatives of the victims went to Downing Street on Friday to hand a letter to Prime Minister Gordon Brown calling for a public inquiry into the bombing. The UK Government has always resisted demands for an independent inquiry and insists that Mr Megrahi’s conviction still stands despite his release.