Now released after just a few years, Babar has paid a small penalty for his role in that atrocity. But, if allegations from a US terrorism lawyer are true, Babar may have been working for the US security services while pretending to be a jihadi – allegations that could imply serious failures to prevent the 7 July bombings. Babar’s story is the stuff of spy novels. One of the most dangerous home-grown Islamist terrorists the US has known was to become the world’s most formidable terror supergrass. Seemingly well embedded in the ranks of al Qaeda, in March 2004 he flew home to New York and moved back into his parents’ detached house in the Muslim area of Queens. US authorities have so far not explained why he was not placed on a no-fly list.