The government's conversion factors come first. Only where no suitable factor exists in the government range may an organisation reach for another published source, such as accredited university or international research, and commissioning bespoke factors is discouraged as poor value. Any such departure shall be recorded in a note, placed in the report, on the website or somewhere similar, that spells out where and why the government factors were not used. Weather correction of emissions data is not permitted.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.