The Bar/Lounge at The Colonnade Hotel
The Colonnade London's bar/lounge is mentioned by professional reviewers writing for major publications. Of the 12 publications that we monitored, 3 mentioned the bar/lounge, like Michelin Guide, Concierge and Zagat.
The Colonnade Hotel 
Michelin Guide
Concierge
Zagat
Michelin Guide "Lower floor bar"
Concierge "If suites are beyond your budget and the hotel's not full, they'll probably upgrade you—if not, you may find yourself a bit squashed and taking refuge in the incongruously mod but still cozy E Bar, noshing on tapas"
Zagat "In-room spa treatments are available too, and there’s a lounge serving breakfast and afternoon tea"
