All very true. There will, I would think, be a disclaimer on materials, if not already, by the makers. The disclaimer will be in the region of warning that electrical work should be done by a qualified electrician if the buyer is in any doubt about the installation. Oh! That's right, there is one on most electrical items in these DIY stores already so I've seen. So this change, or tightening, has been in the wind for a lot longer than we thought then?