David Nicholls – bestselling author of five novels including One Day and Sweet Sorrow, and BAFTA-winning screenwriter – has me over for a cup of tea at the surprisingly peaceful inner-city office where he does all his writing. He talks me through his process (and how it’s differed with every book); how he turned Edward St Aubyn’s five Patrick Melrose books into five perfect hours of television; and why it was letter writing that kicked off his career. 

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