About a decade ago my husband and I went to London and had a week doing touristy things. After going to the science museum we decided to go for lunch and stumbled upon a Chinese restaurant nearby.
From memory the building is on a corner and the restaurant is actually in the basement of the building. The ceilings were so low my husband couldn't stand up straight and my head skimmed the ceiling.
They served a lunch buffet.
We're heading back to London soon and would love to go back there if it still exists. But we can't find any thing that looks likely on google and understand that things change a lot in ten years!