A silly comment.
Building regs and planning are two very separate issues. Taking your argument, we could be fully third world and not have any regs at all for anything. Now one wants over-regulation, but some things are just common sense. They are introducing this reg as many people are being unnecessarily scalded. From a financial view, we pick up the bill via the NHS, and if they are incapacitated for a long time we also pick up the bill. A sensible valve on a CH/DHW system is neither here or there. Nanny state? My God! They are only implementing them on new and renovated property and naturally they will catch on in existing houses too.