The Wifi Cloud is pretty much all around us but I've found that many 'open' and free spots require purchase of a very over-priced and poor quality coffee (yeah, you, Starbucks) clogging your arteries (McDonalds) or buying alcohol (Wetherspoons).
But in Central London, the cloud is far more open and works better.This map from Time Out shows just some fast, open and truly free Central London locations you can access from the street (and 50 yards either way).
View London's free wi-fi guide in a larger map
Update: found another good London Wi-Fi map here.
