What about Crossrail Place in Canary Wharf, doesn't count?

Otherwise there are plenty of other roof terraces which are bars/restaurants. Typically more enjoyable as you don't have to book tickets and you get to enjoy a drink.

I think some people might not count Canary Wharf's various gardens as examples of this because while Canary Wharf is a private estate that is open to the public, the parks and green spaces aren't a quiet strategy to get buildings approved, they're part of the estate's broad strategy to be green and welcoming. Canary Wharf actively encourages visitors to all of their green spaces.