A few years ago I had a panic-stricken phone call from a female friend. ‘Help!’ she wailed. ‘Remind me what classical music I like. I think I’m going to be a guest on Private Passions.’

I could understand her anxiety. The programme, which celebrated its 30th birthday this month, is BBC Radio 3’s lofty version of  Desert Island Discs. Eminent writers, scientists, artists and businessmen, plus the........

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