Professor Jose Torero of the University of Edinburgh's Fire Safety Engineering Centre has spent the last 10 years developing a system that could change the way fires are fought. It's called Firegrid. Horizon examines the vision of one man who believes that the lessons of the Twin Towers on 9/11 have still not been learned, and that the safety of skyscrapers around the world is still fundamentally at risk. The programme puts his new system to the test.
