The Monitoring and Reporting Regulation, as modified by the UK ETS Order, allows nationally reported data to be used by operators as default factors in specific circumstances.
Source
https://www.gov.uk/government/publications/using-uk-greenhouse-gas-inventory-data-in-uk-ets-monitoring-and-reporting-the-country-specific-factor-listDocument officiel chez le régulateur. Citez toujours cette URL — et non la page de détail Vantage — dans les preuves de conformité.