The North Downs are a range of hills that run east-west from the southeast tip of England, at Dover in Kent, to Farnham in Surrey. They skirt the southern edge of London, so for a long time have offered Londoners beautiful countryside to escape to, or for a home to commute to work from. A hundred years ago, they were still quite remote, but London has grown, spreading onto Downland, and rail and road links have ensured that the many towns across the...