SUICIDE bomber Mohammed Sidique Khan was trailed by anti-terrorist forces a year before he carried out his murderous mission, it emerged today. The suspected ringleader of the four London suicide bombers, who was living in Thornhill Lees, featured in a surveillance operation carried out by the intelligence services last year. Khan, 30, was secretly filmed and recorded speaking to a UK-based terrorist suspect, who cannot be named for legal reasons, the BBC claimed - attributing the report to a "well placed source". A joint investigation by BBC Radio 4's File on Four programme and BBC2's Newsnight also suggested that Sidique...