Why did Alastair attack me so ferociously? And why doesn’t the BBC employ him as an interviewer?

Threatening letters on 10 Downing Street-headed notepaper are scary and I admit taking fright. My autobiography, Chance Witness, was on the verge of publication, and I was heading for the Grapes in Narrow Street for lunch with a Foreign Office friend when my mobile phone rang. Would I call my editor’s office urgently? I did.