[Dan_Sette]

OK. Let's get to the nub of this. Putting aside morals or what you believe to be right or wrong.

Is it wrong to hijack your neighbours router. Perhaps the word "hijack" gives us a clue here?

However, the official word is:-

Yes. Not only is it wrong, it is illegal. Following several arrests, the police say if you tap into someone elses equipment without thier knowledge you are commiting an offence by dishonestly obtaining electronic communications services with intent to avoid payment