Masterpiece Theatre: once upon a time, it was a faithful purveyor of literary adaptations, providing reams of original dialogue, close attention to period details, and the gentle paternalism of Alistair Cooke. It hired celebrated actors from the stage but eschewed Hollywood celebrities. Dominated by an aesthetic that kept the camera excruciatingly still, it fit the subdued mood of Sunday night and the sluggish metabolism of middle age. In short, it was Grand Television, designed for an older cultural elite who did not watch television.
Almost all traces of its former identity disappeared as the program underwent a radical relaunching in 2008. Tuning in on Sunday nights, viewers …