The photos below, taken earlier this month, give a quick insight into the state of play at Farringdon. The first two give a good view of the the temporary roadway down from Charterhouse Street over the ex-Thameslink Moorgate line (to allow lorries to take materials down to trackside and remove spoil).
The third shows the piling now underway both for the extended platforms and the integrated ticket office.
Both the elevated shots were taken from roof level on Cowcross Street.
Thanks to G Cole for those of the images above that were not taken by myself.