It's been a while, but CaraB was closed last night.
There was an curious moment at the end of the class, when the milonga started but the lighting wasn't changed. For about ten minutes the lighting used for the class was on for the milonga. Then someone remembered and it was switched off, and the coloured spots and flickering lights were back on. It was a curious moment because for those ten minutes Negracha looked like... a milonga! A good parquet floor, tables round the periphery, couples dancing. Ten minutes of nostalgia!
It made me wonder: if there is one single factor that could improve the floorcraft in London milongas, it might well be the lighting. When you dance in semi-darkness, with pools of light, and with varying colours and flickering lights too, it might just be harder to be aware who is around you. & because it is darker you feel less exposed, so you might be less responsible. In my very limited experience I don't know a single milonga in BsAs that is dark and unevenly lit, or a single milonga in London that is light and evenly lit. Simba, in that very helpful post on starting a milonga, suggests that dim lighting isn't a good idea, because people should be able to see each other: he recommends good lighting for social reasons, but I think it might be advisable for the quality of the dance too.