Coffee Chains in London

In central London, you will encounter a fair number of Starbucks.  You will also encounter a couple of (Italian) coffee chains you won't see in the United States - Costa and Nero.  These chains serve drinks that are about the same price as Starbucks and I have come to prefer them to Starbucks.  They may not have frappuccinos, but they do have pretty good cappuccinos and espressos