As I stated, more or less, in my PM to Saab chap after he closed this thread, I wasn't intending to do this on an illegal basis. As has been mentioned, there are many legitimate free networks out there and sorting the wheat from the chaff is often difficult when your wifi detection program picks up tens of different networks to choose from.
I would add that in these internet enlightened times, anyone who can't be bothered to enable security on their network deserves to get piggybacked. Perhaps that is just me