Consumption is the key

That story about Thames Water commissioning a survey of the real population of the London area and finding that it contains 12% of unsuspected illegals, based on water consumption, has been outed as nothing new.
    The sewage output of an area has been used in the past to work out real populations. Which leaves us wondering why the government never goes after real world data instead of making guesses. Probably because it’s easier to lie about the guesses than actual facts.