Who buys the toilet roll ?
Its not expensive. Just do it. If it's becoming a problem just do it. Do it once more. Then do it once more (third strike). This time don't do it, keep it in your room. If it still doesn't happen then it's time to strike: you've got a full arsenal and unquestionable moral high ground, so go for it with both barrels. If the response 'is like its SUCH a COMPLETELY trivial issue', then its definitely time to move, because you are living with people who expect you to be their parents. A good test on this one is to say exactly this: I'm not your parents. Blank glances mean you're moving soon.