BT are due to roll out a whole load of them during the Summer. They're calling it BT OpenZone.
The internet cafe company called Internet Exchange are also doing it (or going to).
Click here >>
http://www.theregister.co.uk/content/59/29502.html
and here >>
http://www.theregister.co.uk/content/59/29093.html
There are quite a few articles... if you want to see all of them, go to
www.theregister.co.uk and on the left hand side search field, near the top, just type in "hotspots".
Cheers