if, like me, you took a wander down the platform at Farringdon in the last day or two to have a look at this week’s defect, you’d see that not only had it been picked up, but it was marked up for replacement. The defect was still in date, but evidently wasn’t replaced quite soon enough. (Or in other words, deteriorated more rapidly than is usually expected for a defect of this nature).
the Grinder was out on Sunday, on that line, albeit not there, but no doubt that meant planning in a repair of the defect was more difficult.