Edit: contrary to easy guesses, the Cockburn that will be most familiar to the readers of the Spectator is not Andrew, the third brother, but a pseudonym inspired by Admiral Sir George Cockburn (see https://thespectator.com/uncategorized/real-cockburn/ ), incidentally related to the family of journalists. Andrew Cockburn (mainly editor of Harper's Magazine) does occasionally write for the Spectator, but is not the "Cockburn" of the vitriolic articles.
Another piece following the book (Claud's biography recently written by Patrick), Claud Cockburn was the journalist’s journalist, https://thespectator.com/book-and-art/claud-cockburn-was-jou...
Edit: contrary to easy guesses, the Cockburn that will be most familiar to the readers of the Spectator is not Andrew, the third brother, but a pseudonym inspired by Admiral Sir George Cockburn (see https://thespectator.com/uncategorized/real-cockburn/ ), incidentally related to the family of journalists. Andrew Cockburn (mainly editor of Harper's Magazine) does occasionally write for the Spectator, but is not the "Cockburn" of the vitriolic articles.