If they have disappeared "off the radar", by definition, they are not "getting Government money". They have entered the black economy, the economy where you pay cash in hand for a new driveway, garden fencing, skip sorting, or the economy where your business transactions are carried out in the Gents of your local Pub, where you exchange a few shekels for a baggie. A solution is to introduce national ID, and institute police checkpoints at train stations, shopping centres, major street corners, rolling army check points to pull over cars, question the occupants, as they did in Northern Ireland. 21st Century enhancement include retinal scans. Chip new borns just like we do with dogs Add to that a recruitment campaign to sign up half the population to sign up as National Witnesses; patriotic eyes and ears of the Crown. Just like they did in the DDR. Yeah, I have sat at Army checkpoints, with a SA80 shoved in my face with a cheery "you ain't <deleted> going home tonight matey" or "why have you got an English driving licence. Where's your log book" or "is that Billy or Liam?". We are not a nation of informants.