Whilst BT offers a free taster of their £6 per hour OpenZone wifi
(see  http://www.theregister.co.uk/content/69/34342.html ), the lower end of Burngreave Road is (possibly) the most connected wifi space in Sheffield.

 http://www.consume.net/nodedb.php?pos_x=435827&pos_y=388897&action=recenter&old_scale=20&scale=5&old_size=480&size=480&Submit=Go%21

Several local community organisations all share resources through a wifi network and give the excess capacity to the community.