This was it: as soon as I stepped through the door of the offices of Khaled Mishal I held out my flimsy plastic folder and jabbered away in English to the four slick-suited men who were my reception committee, trying desperately to make clear that, yes, there was a potentially lethal weapon in there. I smiled and pointed sheepishly to the scissors, and they were confiscated before my cameraman and I were allowed to pass through the airport-style security portal. It was hardly surprising we were tense: it was the autumn of last year and we were making a film about Hamas for Channel 4. Khaled Mishal, the unofficial leader of Hamas, was in some ways a dangerous man to be talking to. Indeed, the reason he was unofficial leader was that his two predecessors had been assassinated by the Israelis and he himself had almost been killed in Jordan when a Mossad agent sprayed poison into his left ear.