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1 There is no right in domestic law on or after IP completion day to challenge any assimilated law on the basis that, immediately before IP completion day , an EU instrument was invalid. 2 Sub-paragraph (1) does not apply so far as— a the European Court has decided before IP completion day that the instrument is invalid, or b the challenge is of a kind described, or provided for, in regulations made by a Minister of the Crown. 3 Regulations under sub-paragraph (2)(b) may (among other things) provide for a challenge which would otherwise have been against an EU institution to be against a public authority in the United Kingdom.