> "Given that the UK decided not to make itself subject to REACH, that presumably means it wants to diverge, which introduces uncertainty. Now, it's _possible_

> "Given that the UK decided not to make itself subject to REACH, that presumably means it wants to diverge, which introduces uncertainty. Now, it's _possible_ that having its own copy of REACH was just political posturing (if you're taking the cynical approach, you might assume that this is even likely), but I can't imagine anyone would want to depend on that." There is no difference to TSMC. The UK "diverging" i.e. making changes to its UK REACH regulations, versus the EU making changes to its EU REACH regulations. To TSMC these events would be one and the same. Uncertainty exists at all times. Business recognises this and, like the Internet, routes around it when possible or otherwise just absorbs it and gets on with business. The UK copy-pasting EU REACH into UK REACH was /obviously/ done for business stability and environmental reasons and because generally it was just the right thing to do. Painting it as "political posturing" is certainly a highly cynical even hyperbolic interpretation.