text: Sorted I think. Standing on one of the platforms close to Trinity Hall I can see partial remains of the old Winthrop bridge. Now also part of the construction works.
  
  There's also more construction to the West of Trinity Hall than I previously thought. It seems Winthorp street was previously accessed via the East of Trinity Hall (visible in Bing Aerial if you study it closely) but this too is now part of the construction area. I've drawn it in and marked it as closed. 
  
  This leaves the question of access to Trinity Hall. There can be at most pedestrian access, the two possible footpaths are both signposted "closed" with no indication of an alternative access. My suspicion -- Trinity Hall must be currently vacant but will perhaps re-open when crossrail is complete. 
  