Stay Beautiful - run by Simon Price at various venues but most memorable for me was at he Purple Turtle in Camden when I was in my late teens/early 20s. I snogged so many girls there and got drunk and danced a lot, really fun.
Probably stopped going by the time I was 22 as I was more into going to Durrr (formerly trash) at the End in Holborn and dancing just as much but listening to more electronic influenced stuff.
In more recent times my mate runs a club night at the Shacklewell called Blackadder and Friends, used to be at Mascara Bar and it was awesome there but he plays good stuff, has good djs I recommend.
Also Cave Club at Moth is good, get a live band but is probably a little more northern soul/60s influenced. Still wish it was at Buffalo Bar though (have you seen what that place looks like now? URGH)
Shout outs to Panic, White Heat at Madame Jojos and various nights around shoreditch in the mid 2000s - Catch/333/Macbeth to name a few.
Wasn’t a fan of afterschool or frog really, liked smaller buzzier places.