With mains voltages continuing to rise above the 253v upper limit and given that the +10% -6% is a statutory requirement detailed in the ESQCR who is the enforcing body. A quick skim read of the ESQCR puts some reportable parts within the HSE's remit but it is not clear who would enforce over voltage supply issues unless someone is injured. I can only assume that OFGEM who issue the operating licences for the DNO's would be the enforcing authority, so do we need to start raising complaints to OFGEM where DNO's continually do nothing to fix ongoing overvoltage problems