[goatforce5]

This site is within the bounds of the old Roman city of Londinium and is well known to be loaded with archeologically interesting stuff (2000 years of continual habitation will do that). This exact plot of land contained the Temple of Mithras which was already considered very important:

https://en.wikipedia.org/wiki/London_Mithraeum

I'm told that lots of the office buildings in the area have Roman ruins just kinda bricked in and sealed in the basements. i.e., they get discovered during excavation, measurements are taken and whatnot, and while it's worth saving them it's not worth putting them on display and making a big deal out of it.