My first thought was 21 - that many? I actually thought there would less tbh. Still a low number for a country of that size.
I have very limited knowledge about lesbian bars other than watching the documentary series Candy Bar Girls from 2011. I remember it being quite interesting.
The bar was in Soho and owned (I think?) by a gay man who also owned a larger, more profitable gay club.
I don't recall any identity politic stuff being a feature, I think maybe the issue of men (the old fangled type) coming into the space might have been raised.
Happy to be corrected but I think it closed because it wasn't making money. It's been a long time since I watched it though.
I don't think that was out of the ordinary for a lot of bars at that time. Around the same time I had a friend who was struggling to make a small cabaret bar work. She also closed down despite it being a great venue.
I remember her saying that the issue was rent was high, the bar had a small sq footage and safety regs meant they could only have so many patrons in one evening. A lot of those patrons weren't consuming enough at the bar to make it profitable in part because a lot would drive to visit then only buy the odd coke or orange juice.
This was in a smallish town though so there could be different factors at play in central London.