I don't know if there are any later ones, but these were let of with an "admonishment", a slap on the wrist really. -
BBC NEWS | England | Hereford/Worcs | Two cautioned over wi-fi 'theft'

I think the main point is if you allow someone to use your connection like this and they download illegal content, music, video, or even worse child porn you will have one terrible time convincing the Law that it was not you. An unsecure network is not an excuse.