This is all a bunch of tin-hatted flim-flam, but I would be seriously interested in seeing what advice a group of actual security professionals would put forward.

Here in the UK, I can't begin to imagine how hard it would be to go missing and stay missing. Cars are tracked by Automatic Numberplate Recognition systems, bus and train stations all have plentiful CCTV, the cash economy has been decimated - its an interesting thought experiment when considering our levels of state surveillance. As far as I can work out, your only options would be destitution or a dinghy across the channel.