We visited an East End basement bar years ago in the style of the owner’s East European babushka’s home and some pretty weird cocktails - eg a glass pipe with a liquid, you pour another liquid and it “smoked”.
Went to the Aqua rooftop bar the other day - it was ok.
Can anyone recommend good options that are unique?
Not sure about unique but The Bloomsbury Club is excellent.
You should also check out the Experimental Cocktail Club in Chinatown.
If you’re after weird/science-like cocktails, The Alchemist is fun.