Hire the coolest bar in Belgravia

These aren't just regular bars, they're cool bars. The type of bar you want to go to with a date you're trying to impress or take your mates from out of town to make them think - wow, our friend is pretty cool. How'd they find this place? They must really have their life together. Go on, hire out one of the coolest bars in Belgravia for your next event. Bar keep, your haziest IPA, please!