Its not so much EU standards as International Standards i.e. ISO. These standards are agreed amongst most international standards bodies. In our case represented by the British Standards Institute on behalf of the british government no matter which party.
These same british standards are developed by representatives from british industry, in the old days it would have been the national coal board, british steel, society of motor traders, british gas etc, etc. depending on which standards were being discussed, updated or amended.
If anyone had to make major changes then its the fault of your negotiating body. A huge number of current ISO standards are taken from the previous british standards with very little change.