My review of volume one of Sylvia Plath’s letters will be in The Times on Saturday. I decided to say very little about her relationship with Ted Hughes, mainly because she doesn’t meet him for the first eleven hundred pages of the book, but also because I wanted to give a flavour of the full range of her voices, and not focus on the love letters that were extracted in the Daily Telegraph last Saturday.

But I have inevitably been asked whether this new volume contains material that I would have w...