I'm just adding a construction site, and nearly finished building here. See this photo: www.instagram.com/p/DY71xe2DXgI/?img_index=2 (viewing eastward from Farringdon St) .The same building also faces onto Holborn Viaduct at a higher level. I've added it roughly.

I stopped short of deleting it, but I'm fairly certain that this "Newcastle Close" no longer exists. I'm also not sure about the little service road from Bear Alley to the south. I wonder if there's any way of seeing those bits around the back of this building and check the extents.