This is worrying. A man has been arrested for using someone else's wi-fi internet connection without permission. The article does say that "Wireless networks must usually be protected with a password to block unauthorised users" but it's not clear whether the man hacked into an encrypted wifi network or was just using an open unsecure one.
I feel there is an unwritten cultural rule that if you leave your wifi access unsecured then you are happy for others to use it. Also if you are using someone else's wifi, even in a cafe, you don't generally run wifi intensive applications like Second Life or download films as it's selfish. I wonder if the law reflects this?
Strangely today I realised that I know quite a lot about American child protection laws (COPA and COPPA) and recent changes to those laws, but I have no clue about UK laws for this.