London's best rooftop bars - Telegraph The recently-opened Radio Rooftop bar, situated on the tenth floor of the ME London hotel features some of the best panoramic views of the city. With tapas and cocktails (at around £10 each) on offer, and occasional live DJ sets, this bar, which is open from 11am till late (3am Thurs-Sat), is the perfect place to soak up the afternoon sun or the dazzling city lights at night. By Sophie Christie