The crossings are visible on both Bing Maps street view and Mapillary, which have licences compatible with OSM (use of Google Maps/Street View is prohibited by their licence). 

An example of relatively recent imagery for the Thomas More Street crossings is here:
https://www.mapillary.com/app/user/wasd42?lat=51.50859092482358&lng=-0.06912037297161078&z=18.581312534415048&pKey=274005104421719&focus=photo

The crossing details were also confirmed and updated by physical surveys by myself and @okwithmydecay, both local mappers.