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WE WANT doctors to be bright, confident and highly trained. We want them capable of action, able to make difficult decisions on our behalf. We also want them not to be murderers, and here they sometimes let us down. “When a doctor does go wrong,” Sherlock Holmes explained to Watson, “he is the first of criminals. He has nerve and he has knowledge.”

In June 2007, two car bombs were left near a London nightclub, and the following day a car rigged to explode was driven into Glasgow airport. Bilal Abdullah, now serving time in jail for his involvement in…

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