Benjamin Field, 28, from Olney, Buckinghamshire, is accused of conspiring to murder the 83-year-old pensioneA 101- year-old woman became the oldest witness in a British murder trial yesterday as she confronted the men accused of plotting to kill her two friends.Former Stowe School secretary Liz Zettl was the third intended target of Ben Field, 28, and 32-year-old Martyn Smith, jurors heard.Field is accused of murdering the prestigious school’s former head of English, Peter Farquhar, 69, and conspiring to kill his neighbour Ann Moore-Martin, 83, in the village of Maids Moreton, Buckinghamshire.Both pensioners were allegedly manipulated into changing their wills in the defendants’ favour after a concerted campaign of mental torture and poisoning. In a case dubbed the Midsomer Murde
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