I believe I saw this program broadcast on the Discovery Channel in the United States on January 22 2006. The title shown after commercial breaks was "Psychology of Suicide Bombers" and Anne Gartlan was credited as the narrator, but the director, producer, and editor credits match up. And since the closing credits called it a "BBC Discovery Channel Co-Production" with copyright year 2005, I am fairly confident I am commenting on the same program.
If my memory serves, the program examined and attempted to explain what was going on in the minds of suicide bombers (not necessarily just the 7/7/2005 London bombers, but other attackers also) and why they did what they did. I vaguely recall video footage of one female suicide bomber whose bomb failed to go off, and her anguish over her 'failure'. I recommend this program highly.