Prime Minister Gordon Brown has said there was "no conspiracy" leading to the release of the Lockerbie bomber.
He added there had also been "no cover-up" over the UK's dealings with the Scottish or Libyan governments.
The bomber, Libyan Abdelbaset Ali al-Megrahi, was released last month by the Scottish government on compassionate grounds as he has terminal cancer.
Meanwhile the BBC understands Megrahi has had chemotherapy and is now in a cancer ward at a hospital in Tripoli.
Carole Walker reports.