Churchill: The Power of Words
From National Review -
Unlike many of his contemporaries, Churchill had scant capacity for extemporaneous remarks. This much is obvious from his unscripted V-E Day speech, which is egregious among the collection on display. Such was Churchill’s reliance upon preparation that his friend, Lord Birkenhead, joked that “Winston has spent the best years of his life writing impromptu speeches.”
But what speeches they were, exhorting the West to stand against the forces of darkness.
Curiously, given how much Churchill wrote, dictating to his secretaries, this image is the only one I've found which shows him with papers, perhaps revising his Second World War history, perhaps reading war memos. The portrait is by Frank Salisbury and is held by the National Trust.