Owing to the death of Margaret Thatcher, former Telegraph editor Charles Moore will be publishing her biography immediately after her funeral.

Former Telegraph editor Charles Moore has written a biography of the late Margaret Thatcher. Moore has announced that he will publish the book immediately after Lady Thatcher's funeral, and predicts that there is a huge possibility of the biography becoming a bestseller. The biography has been titled "Not For Turning".

Moore resigned from his position as the editor of the Sunday and Daily Telegraph in 2003 to concentrate on writing the biography and tells The Guardian that he was contractually forbidden to speak to newspapers. He received commission for the book in 1997, which gave him access to all of Thatcher's private papers, including her extensive correspondence with a shadowy figure in previous biographies, and her older sister, Muriel, who died in 2004. Thatcher also gave him her approval to conduct future interviews with friends and colleagues, staff and her family for the book.

Stuart Profitt, a director at the publisher Allen Lane, said the book would take over previous efforts. He admitted he was astonished at how much information on Thatcher had not been made public before.

"At the moment when she becomes a historical figure, this book also makes her into a three-dimensional one for the first time," he said. "Moore is clearly an admirer of his subject, but he does not shy away from criticizing her or identifying weaknesses and mistakes where he feels it is justified."

The contract for the biography provided that nothing would be published until after Thatcher's death. Within hours of the official announcement from her family on Monday, Allen Lane, the imprint of Penguin Books, said the first volume, which ends with the dinner party to celebrate victory in the Falklands war, would be published immediately after the funeral. Moore is working on the second volume which has been titled "Herself Alone".