This is a forensic examination – by the man best placed to do so – of what it costs to run the United Kingdom’s economy. To follow the money. To provide an explanation, of where that money comes from and where it goes to, how that has changed and how it needs to change. We are heading off, in fact, on a journey to not just follow the money, but to track it and pin it down, to find out how much of our money government takes and spends to keep the country we recognise as the UK running. Government decisions determine the welfare of the poor and the elderly, the state of the health service, the effectiveness of our children’s education, and our preparedness for the future: whether that is a pandemic or global warming. As a society, we are a reflection of what the government spends.