DR Jim Swire, whose daughter was killed in the Lockerbie tragedy, has written about the "painful task" of clearing out her room after her death and his struggle to avoid becoming bitter.

In the foreword to a new book by John Ashton, biographer of the Libyan convicted of the bombing, Abdelbaset Ali Mohmed al Megrahi, Dr Swire describes Flora as "our deeply loved elder daughter" slaughtered "a day short of her 24th birthday". She was on flight PanAm103 because she wished to visit her boyfriend in Boston for Christmas.

"If we had only said no..." he writes. "We would still have Flora with us."

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Yesterday, at the launch of the book, Scotland's Shame, Dr Swire and Mr Ashton released an open letter to Frank Mulholland, the Lord Advocate, asking why he dismissed new evidence revealed in the 2011 biography of Megrahi, and why the witnesses relating to this evidence have not been questioned. Dr Swire said a public inquiry is the only way to answer the questions and concerns of the relatives of the 270 victims and the only way to hold the Crown Office to account.

The Scottish Government has repeatedly refused and instead called for Westminster to hold an inquiry or for the case to be tested with another appeal in the courts.

Dr Swire and Mr Ashton said an appeal, even if feasible, would not answer questions about the Crown Office's failure to disclose key documents.

The Crown Office said the case is still live and it therefore cannot comment.