I’m jealous. The building code in Wales must not be very strict.
At the Gaia Health site where this was posted, there’s also a post about a school in New York State in which six teenaged girls have suddenly come down with neurological tics similar to Tourettes. The vaccine that supposedly prevents cervical cancer is suspected.
A lot of times, even in America, if your house is under a certain number of square-feet, you don’t have to follow codes, and some areas (like ours, thank goodness) have a line or two in the code about “not restricting new ideas” or “encouraging innovation” which a kind-hearted code enforcer (rare, but not-yet extinict!) will apply to your funky, low-impact, dwelling! Research, you might be surprised!