I read what many Londoners say about Uber like they never heard about Addison Lee cabs, which existed years before, offer a nice app, professional drivers and fixed tariffs. Last time I checked, tariffs were about 20% higher than Uber. But depending on congestion, could end up cheaper. Most of my friends were praising Uber, but I was warning them that their prices are unsustainable and slightly higher easy-to-hail cab services with apps have been for years on the market largely unnoticed by hipsters ;-)