"As of date X, all existing EU regulations remain in force. Changes to UK law that overlap with existing areas of EU regulation will result in a notification to the Commission".
Done. There is no need to 'replace' detailed regulation on a thousand topics when, as you observe, it is already implemented in UK law.
"As of date X, all existing EU regulations remain in force. Changes to UK law that overlap with existing areas of EU regulation will result in a notification to the Commission".
Done. There is no need to 'replace' detailed regulation on a thousand topics when, as you observe, it is already implemented in UK law.