Just off Regent Street, the roof terrace at Aqua is a little bit sceney, a lot expensive, but very convenient. The drinks are decent and the bar’s accessed via a swanky Japanese restaurant that’ll either be the best thing or worse thing in the world when you’re several drinks deep. Is the view great? No, absolutely not. But it’s a nice place to sit after work on a warm day. Keep it to that, and you’ll have a great time.