(1) A court or tribunal -

(a) is not bound by any principles laid down, or any decisions made, on or after IP completion day by the European Court, and

(b) cannot refer any matter to the European Court on or after IP completion day.

(2) Subject to this and subsections (3) to (6), a court or tribunal may have regard to anything done on or after IP completion day by the European Court, another EU entity or the EU so far as it is relevant to any matter before the court or tribunal.

(3) Any question as to the validity, meaning or effect of any assimilated law is to be decided, so far as that law is unmodified on or after IP completion day and so far as they are relevant to it -

(a) in accordance with any assimilated case law, and

(b) having regard (among other things) to the limits, immediately before IP completion day, of EU competences.

(4) But -

(a) the Supreme Court is not bound by any assimilated EU case law,