The missing: Each year, 275,000 Britons disappear

Odd place, Britain. Every day, 13 million CCTV cameras track our movements. We're PIN-numbered, databased, credit-rated, nannied, Neighbourhood Watched, Facebooked, emailed and GPS-ed. You wouldn't think any of us could slip away unnoticed. But we do, in ever-increasing quantities. An Independent on Sunday investigation has established that the numbers of Britons who disappear each year is now at record levels.