I don't think there is any need for them to do any 'interpreting' if all they are doing is to say that it is acceptable to work to alternative (by implication, other countries') regulations, is there? ... and, of course, we're not talking about 'laws' - at least as far as the UK is concerned.Perhaps, but does BS7671 or JPEL/64 have the authority to interpret UK or other countries' law?
Kind Regards, John