Enter the extraordinary David Collins-designed 50-seat Blue Bar in the elegant Berkeley Hotel in the heart of the Knightsbridge and you soon realise what’s in a name. From the walls to the carpet to the pale leather designer chairs, everything is painted in a delicate, soft, pastel puff of blue. Ok, there are dashes of other colours: red lampshades on walls; white onyx bar counter; golden glow from 50 types of whiskey on the shelves behind it; but you get the picture. Adding to the refined air of porcelain glamour are waiters in white tuxedos who ferry perfectly poured cocktails to your table with tapas snacks, and there's a cigar menu paired with a wine list to help you match your drink with your smoke. True, it's very expensive, but this is Knightsbridge and you pay for class.