"Thousands of people break the law and risk serious contamination of the dining water supply, so it's fine for me to do it too" isn't the argument you think it isDespite all the objections because of it being an illegal installation because there are no air gapped tanks supplying it, how likely is it that it gets dropped in the loo and there is potential contamination?
A big fuss over nothing.
I have one too, it's great for washing down the big sink I have when it gets full of little hairs after a shave etc.
Fix the leak and move on, no matter what you do your mate is going to use one, there are thousands of them installed in houses in the U.K.
