The key piece of material evidence used by prosecutors to implicate Libya in the Lockerbie bombing has emerged as a probable fake. Allegations of international political intrigue and shoddy investigative work are being levelled at the British government, the FBI and the Scottish police as one of the crucial witnesses, Swiss engineer Ulrich Lumpert, has apparently confessed that he lied about the origins of a crucial 'timer' - evidence that helped tie the man convicted of the bombing to the crime. At a trial in the Netherlands in 2001, former Libyan agent Abdulbaset al-Megrahi was jailed for life. Later this month the Scottish Court of Appeal is expected to hear Megrahi's case, after [a ruling] in June that there was enough evidence to suggest a miscarriage of justice. Lumpert's confession, which was given to police in his home city of Zurich last week, will strengthen Megrahi's appeal. Swiss businessman Edwin Bollier, who has spent nearly two decades trying to clear his company's name, is as eager for the appeal as is Megrahi. Bollier's now bankrupt company, Mebo, manufactured the timer switch that prosecutors used to implicate Libya after they said that fragments of it had been found on a Scottish hillside. 'I was shown fragments of a brown circuit board which matched our prototype. But when the MST-13 went into production, the timers contained green boards. I knew that the timers sold to Libya had green boards. I told the investigators this.' In 2001, Bollier spent five days in the witness box at the Lockerbie trial ... in the Netherlands. 'I was a defence witness, but the trial was so skewed to prove Libyan involvement that the details of what I had to say [were] ignored. Few people apart from conspiracy theorists and investigative journalists working on the case were prepared to believe Bollier until the end of last month, when Lumpert ... walked into a Zurich police station and asked to swear an affidavit before a notary.