Leo McKinstry says the current craze for genealogy reflects an unhealthy combination of snobbery and inverse snobbery, and is a poor replacement for national history When I visited the National Archives at Kew last week the place was full of them, scurrying about with their plastic wallets in hand, a look of eager concentration on their faces. It was impossible to escape their busy presence as they whispered noisily to relatives or whooped over the discovery of some new piece of information. These were the followers of one of Britain’s fastest-growing craze, the mania for researching family history. Studying bloodlines...