Of course it should be noted:

"SF is an online service for the RoRo freight industry BEING
developed by the government. The service will help to simplify and automate the process of establishing the border-readiness of an HCV to help mitigate the risk of delays."

and

"While the SF portal’s traffic light system would be advisory across the country, we propose to make its use enforceable in Kent. This is because of the particular disruption risks at the Short Straits if levels of border-readiness are low – widespread use of SF has the potential to significantly to mitigate this risk."

and

"A viable border-readiness regime is critical to maintaining the flow of traffic at the border after the end of the transition period. While upstream declarations using the SF portal with compliance and enforcement in Kent is our preferred option, we must develop contingency plans in case the SF service is unavailable (for example, due to post-deployment IT failure in 2021)."

We live in interesting times.