Every time I hear the comments on either misc. sunds. radio programmes or the television that tracking people coming into the UK (or anywhere else, frankly) is an issue that needs to be solved by yet another app, I, like perhaps many others, reach for a handy brick to throw. I usually manage to settle for hurling vapid abuse, which is decidedly less damaging and yet, also acts to relieve the tension. The ability to track a person, their booking, their passport, where they ha