Click here to access article by Don Quijones from Raging Bull-Shit.
I have not viewed the BBC video so I cannot comment on its quality. But notice that this was released to the British public in 1992. The reason for this was, no doubt, to manage the fall-out of information first released to the European public in 1990 by key Italian figures who had knowledge of this secret CIA organized program in Italy. You can learn most of the details about this operation in a very important book entitled NATO's Secret Armies by Daniele Ganser published finally in 2005.
Following these Italian disclosures other informants came forward in many other European countries reporting about the same Gladio operations in their countries. This was sensational news in Europe, but barely made a dent in US coverage. I, as a reasonably informed political person, was not aware of it until several years later when more obscure US left wing publications made mention of it.
Unbeknownst to most people, the CIA in the 1990s developed an updated version, something like Gladio 2.0. Sibel Edmonds, an exceptionally courageous FBI whistleblower, has written many articles and done many interviews on this subject which she first learned about as an FBI translator translating reports coming from several Middle Eastern countries shortly after 9/11. According to her this updated version is known by US secret services as Gladio B.
She describes this updated version in her recently published work of political fiction entitled The Lone Gladio. (If you don't know what "political fiction" is and how this form is used, click on the above link.) This new version is one which specializes in false-flag operations using terrorist front organizations, assassinations, and drug-trafficking. Sound familiar? She provides extensive information about Gladio B also on her website, Boiling Frogs Post. You might start with this article entitled "Georgia: The New CIA-NATO Arab Terrorist Training Center".