AN IMPOTENT husband who encouraged his wife to sleep with other men stabbed her to death when she told him that she was leaving for a lover 30 years her junior. Christopher Willsher, 53, lost control and attacked his wife, Jeanette, with a kitchen knife, stabbing her 112 times. Willsher was sentenced yesterday to six years imprisonment after a judge at Plymouth Crown Court accepted his plea of guilty to manslaughter on the ground of diminished responsibility. ..................... Anthony Smith, QC, defending, said that the marriage had been happy until impotence struck. Mr Smith said: “He loved her and was...