Fit every house in the country, private or council owned, with a swipe card access on the inside. Everyone above the age of 15 has to have an IQ test, anyone below a certain level is denied leave of their house. Within a month, the majority of scrounging chavs, thugs and idiots have died in their own properties. Their possessions are then used to pay off national debt, their houses are used to rehome those that need it, and the benefit culture is stopped almost immediately.
Job done, everyone's happy, and those that aren't are dead!