Hi there. I'm a Londoner, but I'm afraid I don't know of many wireless hot spots, and especially not free ones.

I believe there's a lot of wireless available in coffee bars, but I think you have to pay for it.

In Upper Street in Islingon there's a free WiFi called StreetNet - but I have not yet succeeded in connecting to it with my 770. (The 770 detects the ESSID, but the connection never stabilizes such that the W stops flashing - I guess because the signal is too weak.)

Finally, prepaid SIM cards - you can pick these up in almost any newsagent or Post Office, but what's included varies a lot so you'll have to check.

Regards - Neil