http://www.bbc.com/news/uk-scotland-south-scotland-26528745
„A documentary claims to have uncovered fresh evidence that Iran, not Libya, ordered the bombing of Pan Am flight 103 over Lockerbie in December 1988.“

This claim is easily refutable nonsense. Why? Because the „source“, the „former senior Iranian intelligence official“ Abolghasem Mesbahi is all but reliable as already asserted by FBI officials who checked and analyzed his statements:

„The Iranian defector who was the source of Argentina’s allegation that Iranian officials began planning the July 18, 1994, terror bombing of a Jewish community center at a meeting nearly a year earlier had been dismissed as unreliable by US officials, according to the Federal Bureau of Investigation (FBI)agent who led the US team assisting the investigation in 1997-98.“
http://www.atimes.com/atimes/Middle_East/JA25Ak02.html

The source for the Lockerbie claim is the same dubious person: Abolghasem Mesbahi.

Huffington Posts German edition features an article which raises legitimate doubt regarding the authencity of Mesbahis claims:
http://www.huffingtonpost.de/ali-s-rad-/fakezeugen-aus-dem-iran-i_b_4870491.html
The article calls Mesbahi a „witness by profession“, who has been behind some of the wildest anti-Iranian claims: Not only did Mesbahi accused Iran of being behind Lockerbie and the Buenos Aires bombing. He even blamed Iran for being involved in the 9/11 attacks.

„American intelligence officials had concluded Mesbahi did not have the continued high-level access to Iranian intelligence officials throughout the 1990s and beyond that he was claiming. They regarded him as someone who was desperate for money and ready to „provide testimony to any country on any case involving Iran,“ according to Bernazzani.“
http://www.truth-out.org/news/item/5798:crackpot-antiislam-activists-serial-fabricators-and-the-tale-of-iran-and-911