Shanghai Blues is the new(ish) kid on the block, which is unexpectedly to be found in the less-than-trendy Holborn in a lavish £2.5 million transformation of a Grade II-listed former library. The restaurant is huge and should be impressive. The owners have splashed out on deeply dark furniture, silk awnings and fancy lamps, but instead of being splendid, the whole effect was rather gloomy and hopeless, like an antiques shop in a dying seaside town that has sold off most of its stock.