Thanks Conan. I did consider the 'sharing' option but you can bet your bottom dollar that the day mine's disconnected he goes all security conscious on his. Banging on his door demanding he turns the internet back on may be a touch brash.
You're not alone, I too 'borrow' a little bandwidth from time to time. Never intentionally, I'm always trying to use my mobile, at great expense, to connect... honest.