Jim Swire listened to Rev Mosey as he led the media event
Relatives of those who died in the Lockerbie bombing have welcomed the decision to allow the man convicted of their murder a second appeal.
Rev John Mosey, whose 19-year-old daughter Helga died in the explosion, said he hoped the full facts of what happened would now come out.
He said the appeal was needed for the sake of the Scottish justice system.
His comments came as a group of bereaved relatives staged a media briefing in the Scottish Parliament.
Abdelbaset Ali Mohmed al-Megrahi was jailed for the 1988 atrocity in which 270 people died when Pan-Am flight 103 exploded over the Scottish town.
The Libyan was convicted in January 2001 and is currently in a Scottish prison.
The Scottish Criminal Cases Review Commission, which has been investigating Megrahi's case since 2003, recommended the second appeal.
Rev Mosey, a member of support organisation the UK Families Flight 103, said: "The group feels strongly that the full and true facts about the bombing have not been satisfactorily explained.
"And we very much hope that this long-awaited decision will lead to the emergence of more information."
Jim Swire, who lost his daughter Flora in the bombing, also attended the press conference.
Mr Swire, from Kidderminster in Worcestershire, said: "A lot of people, I think, have hoped that they have achieved closure by the conviction of Megrahi.
"I think for those of us who have looked carefully at the evidence and have doubts, we cannot achieve that until we're quite sure that it really is true and it could be proved that it were true that he was the one that did it.
"It's no good trying to have closure on false foundations. A house built on sand cannot stand."
Mr Mosey said he and other relatives would continue to call for an independent inquiry, a request denied by the former foreign secretary, Jack Straw.
"Her Majesty's government decided that, having had a fatal accident inquiry, and a department of trade inquiry, which nobody knew about, and the original trial and appeal in the Netherlands, in Mr Straw's words, nothing further could be learned by an inquiry," he added.
"And it's very clear to us today, from this announcement by the SCCRC, that there are a number of eminent independent and learned gentlemen in Scotland who believe that there is yet a great deal more to be learned."