Osama bin Laden left more than £20-million in his will so his followers could carry on his jihadist schemes against the West, newly declassified documents show.In several missives that reveal anxieties about both his personal security and his long-term legacy, the slain al-Qaeda leader said he had around $29-million in personal wealth to be used ''on jihad, for the sake of Allah''.His last will and testament is part of a file released by US officials from documents seized during the raid that killed Bin Laden at his secret compound in Pakistan five years ago.The file shows the al-Qaeda leader's increasingly anxious state of mind as the world's intelligence agencies closed in on him. In one missive, he frets over a visit by one of his many wives to a dentist in neighbouring Iran, fearing that a tracking chip could have been hidden in one of her fillings.''The size of the chip is about the length of a grain of wheat and the width of a fine piece of vermicelli," he wrote under the pseudonym Abu Abdallah.The missive ended with the instruction: ''Please destroy this letter after reading it.''The will was released yesterday as part of a batch of more than 100 declassified documents taken during the May 2011 raid on Bin Laden's hideout in the Pakistani town of Abbottabad. ..