The people who lived in England before the First World War now inhabit a realm of yellow photographs. Theirs is a world fast fading from ours, yet they do not appear overly distant. Many of us can remember them as being much like ourselves. Nor is it too late for us to encounter them so intimately that we might catch ourselves worrying that we have invaded their privacy. Digging up their refuse is like peeping through the keyhole. How far off are...