Customs controls need and are going to be imposed whenever there is no official agreement in place (and overseen by the ECJ) for regulatory alignment. And the ECJ oversight is a hard red-line for the UK.
Which means that it isn't a sliding scale. It's black or white. Either you fully align with oversight or you don't. And if you don't then you are hit with the full suite of custom controls.
Customs controls need and are going to be imposed whenever there is no official agreement in place (and overseen by the ECJ) for regulatory alignment. And the ECJ oversight is a hard red-line for the UK.
Which means that it isn't a sliding scale. It's black or white. Either you fully align with oversight or you don't. And if you don't then you are hit with the full suite of custom controls.