There’s been a strong sense of pre-Christmas turkeys coming home to roost in this week’s news, as stories I’ve written about for months or years have reached, if not a denouement, then at least a new twist in the plot. Saddest of these is Crossrail, London’s east-west mass–transit system that was originally scheduled for its royal opening next week: now we hear it needs ‘hundreds of millions’ more of public money if it is to meet its delayed completion a year hence, though even that date no longer looks a safe bet.