Until very recently, most of us hadn’t heard of Carillion. Not having heard of a particular company wouldn’t usually be surprising or unsettling. But this is more like not having heard of the people who have been making alterations to your house, building your neighbour’s and – in an odd display of versatility – delivering lunches to your children. Because it turns out that Carillion is – or was, until its sudden but entirely predictable liquidation on Monday – pretty much everywhere. As a result, several projects, including the building of two hospitals, a high-speed railway and a bypass in Aberdeen, now hang in the balance, along with the jobs of around 20,000 UK workers.