The programme had an interesting format, taking four people who believed in a conspiracy other than the one that really happened on a sort of road trip to examine their beliefs. They tested the plausibility of the bombers catching a train to London, splitting up on the Tube and being in the right place at the right time. Easily enough done, apparently, despite the best efforts of the group to miss the train. They were introduced to a Muslim expert on Islamic fundamentalism, a police officer who was senior at the time, a counter-terrorism expert, a survivor and a bomb-expert who constructed a device from ordinary materials (including pepper!) which blew a bus apart, despite claims that this could only be done with 'military-grade' explosives.
The, rather unexpected, result of all this was that 3 of the 4 revised their opinion that the bombers were patsies, erring more on the side of 'cock-up' rather than 'conspiracy'. One still clung to his belief that it was a vast government/military/corporate exercise to facilitate oh, I don't know. Something. But, on the whole, it seemed to me a worthwhile exercise. Now, if only we could somehow take all the Apollo Hoax Believers to the Moon and show them the proof (though not until those of us who accept its reality have been given the opportunity first!)