John Keats’s ode To Autumn is one of the best-loved poems in the English language. Composed during a walk to St Giles’s Hill, Winchester, on September 19 1819, it depicts an apparently idyllic scene of harvest home, where drowsy, contented reapers “spare the next swath” beneath the “maturing sun”. The atmosphere of calm finality and mellow ease has comforted generations of readers, and To Autumn is often anthologised as a poem of acceptance of death. But, until now, we may have been missing one of its most pressing themes: surveillance.