What I like to do is go and find things like this myself. It's something I call being an adult.
Nothing wrong with asking for a recommendation.
What the Sky garden like can you turn up on a Saturday without a ticket and get entry?
If "fit birds" (sorry, I think the nineties called and they want their attitudes back) are your priority then you could try the Radio Rooftop Bar. Full of plastic women I'm sure.
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^ full of yuppies but a nice location/bar.