I remember reading the following anecdote about Grainer, repeated on Wikipedia, though neither I nor Wikipedia have a source for it: "Grainer was amazed at the resulting piece of music and when he heard it, famously asked, "Did I write that?" Derbyshire modestly replied, "Most of it." [1]

[1]. https://en.wikipedia.org/wiki/Doctor_Who_theme_music#:~:text....