Budgets are all about numbers: growth, inflation, unemployment, headroom. So this week on Westminster Insider , Sascha and Pat look into the numbers behind Britain’s economy — and just how much government policy is really made up of guesswork, rather than solid measurements. Sascha talks to Dr Laura Gilbert, the former director of data at Number 10 Downing Street, who explains exactly why the numbers we have on measurements like immigration or the workforce are often wrong by hundreds of thousands of people. Ben Warner, who was chief advisor on data and digital at Number 10 during the pandemic, explains why this uncertainty spells chaos for political decision-making and says he believes most ministers don’t know how to use data.
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