Made for the BBC, this is the third part of a series by Adam Curtis. It looks at how and why the myth of Al Qaeda was created. It explores how it suited the USA and UK governments to create a nightmare vision of a world wide terrorist web, out of the reality of a fragmented collection of groups and individuals.

As the Press release originally said, "Wherever one looks for this al-Qaeda organisation, from the mountains of Afghanistan to the "sleeper cells" in America, the British and Americans are chasing a phantom enemy.

But the reason that no-one questions the illusion is because this nightmare enemy gives so many groups new power and influence in a cynical age - and not just politicians. "

The show lasts slightly less than one hour. There will be time for discussion afterwards.

The venue is the Town Hall Tavern, Tib Lane. Start time is 7.30 (prompt)